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@M_V thanks for the detailed explanation. I went ahead and ordered some, will see how i get on! From the image it looks like i might have to reduce the thickness of rectangular lug that sits in the length of the dropout.

@853Superfly I went down a rabbit hole yesterday and spent many hours looking through all the builders here http://www.classiclightweights.co.uk/builders.html I haven't managed to find any lugs that look similar.

The frame takes a 26.2mm seatpost.

Heres some pictures from the seller before I had the frame powdercoated:

@853superfly the dropouts intrigue me, as you have noticed they aren't forged. But the rest of the frame has fiddly fancy lugs. Seems odd! I guesstimate that the frame is from the 50's but have no evidence to support this. I bought the frame stripped of paint so know nothing about it. It has 531 stamped on the seat tube and a serial number on the bottom bracket shell, but that info has never helped me identify it.

The original headset cups had on OD of 30.7mm. Which apparently, according to sheldon brown, means its either Austrian or East German.

I agree tugs will likely be a pain, but will see how i get on.

@popdown you have to take credit for finding me such a nice frame!

I suspect some chain tensioners might solve this....

https://www.amazon.com/Origin8-Chain-Tension-Adjuster-Black/dp/B001GPJY1O

So it appears that my non drive side rear dropout isn't flat. So depending on my chain length my wheel alignment goes from being ok to being a complete mess.

heres some images to illustrate whats going on:
Starting off pretty flat, happy days...

...Oh, that doesn't seem right.... that's a lot of light.

... still all over the place here...

... ok right at the back.

for good measure heres a snap of the drive side. all ok on this side:

I commute to work daily on the bike, currently running with the axle right near the front of the dropouts. All seems OK, but I would be much happier if i could have it seated further back. I'm unsure whether to:

a) leave it the hell alone, its working OK
b) maybe approach a frame builder to see if anything can be done to fix it. Does anybody have experience of anything like this? Maybe some material could be welded on and then machined until flat again?
c) put a big washer between the wheel nut and the outer surface of the dropout to span the recessed bit? This doesn't sound sensible, but maybe somebody has some experience either way.

finally heres an image of my bike for "context":

grateful of your thoughts. thanks. josh.

thanks for the reply. headsets are my least favourite bit of bike maintenance, its like saucery. It feels solid when I apply the brakes and rock it back and forth, so yeah maybe too tight. will undo it all and take a look at some point this week.

@russmeyer will try get some more pics this week!

@PhilDAS those soma bars look pretty sweet! I was a little disappointed with the ones i got to be honest.

Apologies all, I have been meaning to keep this more up to date. It all got a little hectic in the run up to our trip! but we made it! Bristol to Paris! Pretty pleased considering I hadn't cycled the bike more than five minutes before we departed.

Here the BJ on the second day in France.

I have to admit however I ran into a few problems. On the third day, my gear indexing went locco (im guessing the cable stretched) but i never managed to get it quite behaving again. Should be easy to sort now back though. More of a concern however, on the final day, while heading into Paris my headset developed a notchiness always wanting to index into the straight on position. Im guessing I didn't do it tight enough and somethings chattered. Im no expert though, any advice welcomed.

Great news. The frame came back yesterday. Head tube corrected and rear drop out faced.

Spent the evening building. Still some bits to do. But I'm super pleased so far. Might get a bigger front chain ring. 40t looks a bit silly with 42 at the back.

Gum walls are fitted and rims de-stickered

( @veLLo i think i have a reebok addiction)

Good news. BJ have replied very promptly to my email. And want the frame back ASAP to get it all fixed. Fingers crossed they can turn it round with time to get it built for Paris.

They explained that they face the dropouts once built to ensure it's all parallel, they suspect they omitted this step.

OK this on google, same rear drop outs. same iso to post adapter configuration. all looks gravy...

@JB & @TheShipwright i think i have fixed them, can you see them now?

general question... am i missing something? or do people agree with my conclusions that the mount shouldn't be at an angle?

build day 2.... lots of swearing....

it's all looking rather good...

but then quickly we hit an issue. the rear brake mount plate isn't parallel to the frame. The rear post - i.s. adapter interferes with the disc:

I can't find the relevant IS standard, the closest I have found is this:
http://www.magura.com/media/1997/is_e_09-12-02_11.pdf
The front mount in the drawing has a tolerance defining how parallel it is the the front axle. I would assume the same would apply to the rear.

I took some measurements:

not parallel :( will be emailing BJ again. Fingers crossed they can sort it before my trip to Paris.

so after a few emails back and forth with BJ, apparently all is fine! the gap is not of structural concern. headset runs nicely so it's all straight. should probably get on and build the rest of the bike.

day one of the build. a snag. bottom of the head tube is not flat at all. paid a bike shop to do the work, they suggest i report back to bj. dang.!

It's a pretty big gap.

Potential build of the year

Wow you have really turned the pressure up to 11 there!

So bits have been arriving, all thats left to order is the seatpost and seat.... if only i knew what size post i needed

IT'S HERE!

@AlfredIV Bike24 had a crazy number of wheels! thanks. in the end i went with the DT Swiss R460 DB Disc Rims with Shimano RS505 Disc Hubs. SJS had the bits to build them when i rang. so they should be with me next week.

Bob Jackson inform me my frame is being painted, so should be with me next week!

Best start ordering things pronto!

So today I'm pondering crankset options. The first question I need to answer is whether my range of choices is limited by the sram 11 speed chain being narrower?

in agreement about the wheels, they were definitely a bad staring point. Looking at the DT 460 DB option. These look rather nice indeed:

https://www.moonglu.com/products/handbuilt-shimano-rs505-on-dt-swiss-r460-db-road-disc-wheels

currently out of stock everywhere I can find them though :(

added a parts list that, still lots of blanks. Unsure on the wheelset as well...

@edmundro thanks for the reply. I need to keep doing a fair bit more research, but i currently like the idea of running it with an 11 speed cassette at the back and a single up front. I've only had the option of riding my single speed for the last few years... all these gears daunt me!

the range on this is pretty big https://www.sram.com/sram/road/products/pg-1130-11-42t-cassette

any advice greatly received!

I was in need of a bike to get me to from Bristol to Paris in July. Seemed like a good excuse to buy a bike I have been lusting after for a long time. So after a lot of discussion with the guys at Bob Jackson i settled on the following off the peg frameset with a twist:

Frame - Audax end to end.
Size - 23”
Colour - Metallic Grigio
Colour of Transfers – White
Lug Lining – Black
Tubing Upgrades - Reynolds 631 Fork Blades, Reynolds 725 Rear Stays
Front and Rear Disc Mounts (rear inside chain and seat stay)
No pump pip.

So now for the fun bit of finding all the parts and building it. I'm expecting the frame mid June.

Work in Progress List of Parts:
Wheelset
DT Swiss R460 DB Disc Rims with Shimano RS505 Disc Hubs
Disc Brakes
Shimano CX75 (http://cycle.shimano-europe.com/content/seh-bike/en/home/road/shifting---braking/brakes0/br-cx75.html)
??rotors??
Brake Levers
SRAM S500 (http://www.tredz.co.uk/.SRAM-S500-Brake-Lever-Set-Aluminum-Levers-for-Drop-Bars_40191.htm?sku=135162)
Tyres
Vittoria Corsa 700C x 28 (https://www.sigmasport.co.uk/item/Vittoria/Corsa-Gand-Isotech-Foldable-Clincher-Tyre/A9WQ)
Inner Tubes
Headset
Tange Levin (http://www.velosolo.co.uk/tangelevin.html)
Stem
Zenith Black (http://www.velosolo.co.uk/zenithgc.html)
Handlebars
deda piega (http://www.dedaelementi.com/?product=piega&lang=en)
Bar Tape
Seat post
Thomson Elite
Saddle
Cambium C17 (http://www.brooksengland.com/en_uk/cambium-c17-4.html)
Groupset / Drivetrain
11 speed SRAM cassette PG-1130 11-42t (https://www.sram.com/sram/road/products/pg-1130-11-42t-cassette)
Apex 1 Rear Derailleur, SRAM (https://www.sram.com/sram/road/products/sram-apex-1-rear-derailleur)
S-500 Aero Shifter, SRAM (https://www.sram.com/sram/road/products/sram-s-500-aero-shifter)
??Crankset??
??Bottom Bracket??
Misc
Gear cables
Brake cables
Front Brake Adapter (http://www.chainreactioncycles.com/shimano-mount-adaptor-front-post-to-is/rp-prod13743)
Rear Brake Adapter (http://www.chainreactioncycles.com/shimano-mount-adaptor-rear-post-to-is/rp-prod13749)

@Kalkhoff thanks for the PM, they were great but I ended up taking a punt on a pretty basic set of 26" forks on ebay and the largest drop caliper brake I could find.....