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But holborn practically is st pancras (when viewed from Kent) ...
It is....'ish', my workshop is located very close to to the LSE just off Aldwych so technically 'South Holborn' I'd guess!
But I was wondering if there's some super-route I'm missing using my usual route of (Dirtfud->Woolwich Tunnel followed by) Silvertown->Dock Road->Lower Lea Bike track-> CS3 at Saffron Ave following it up to Tower Gateway then I've got some wiggles on to Fenchurch Street then past Bank then Cheapside onto High Holborn with final drop down through Lincolns Inn Fields. Sooooo, having read your reply and looked at the Grays Inn ->Argyle St shimmy I could use a lot of the same route I do already which is quite nice actually. Many thanks for the bike lane tip-off on Argyle Street, thats precisely the sort of local info I was hoping for. Getting across Euston Rd looked scary!
out of interest, why cross at Woolwich and not one of the central bridges?
It's the Roman in me!... straightline navigation being the shortest distance between 2 points. Also, there's no hills at all 'cept East Hill in Dirtfud which I hack down using a back road so its cycle-quiet all the way from Dirtfud pretty much to Poplar High Street. I like that, I'm not really a 'group rider' unless I'm forced into it which happens to be the case usually along Cable Street all the way up to Lincolns Inn.
EDIT. See what I mean about fairly straight?
If it was me: from Holborn Viaduct heading west, turn right onto Grays Inn Road towards Kings Cross. Avoid the last awful bit of the junction by turning left into Argyle St (bike lane allows you to go against the 1-way street) and following it to the nice crossing between the lights on Euston Rd, making turning up Pancras Rd easy.
On the way home it's usually more flowing in the other direction so I'd use the main roads for the 1-way system in front of Kings Cross, eastbound on Euston Rd onto Pentonville Rd, get in the right-hand lane for Kings Cross Rd, follow it round and south it turns into Farringdon Rd. And then to avoid Smithfields I'd cut left on Farringdon Lane (mind the step in the road, take it perpendicular!) just to avoid the crossroad, left on Clerkenwell Rd, right on Goswell Rd, past the Museum of London still heading south, then left on Gresham Rd or Cheapside to get to the Bank.
out of interest, why cross at Woolwich and not one of the central bridges? (Blackfriars, Southwark or London would all work) The Old Kent Rd is a bit slow in rush hour, but then the Lower Lea crossing, East India Dock Rd etc isn't all that fun either.