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@FatManOnAFixie
Aye, deffo 68mm Mr Smolders, I check with a Vernier gauge face to face, 67.88mm actually.
The original BB was a 'Chin Haur CH52-68 113.5L', the replacement is one of these -> http://www.ebay.co.uk/itm/SHIMANO-TYPE-SEALED-CARTRIDGE-BOTTOM-BRACKET-SEALED-BEARINGS-110mm-to-127-5mm-/261272331430
in 113.5 sizing, seems identical. I do still have the old BB but damaged one of the 173110-2RS bearings. I was attempting to replace the actual bearings (I repair centrifuges and Lab equipment for a living so have access to a Bearing Press and pullers (which is handy!)) but then looked up the price for a complete BB and for £8.95 gave up!!! :-)
Yeah, I know what you mean re the Chainring to stays distance. To me it makes sense to utilise this big spacing and get the chainring inboard a bit. I think my only recourse to get the chainline back to match the 42mm at the rear hub is to use chainring spacers to offset the chainring.
I took the chainring off the crank spider to clean everything and reassembled it the same way it came apart. I don't think it had ever been cleaned (or seen oil either in the last year). There were no spacers so I dont think I've put anything back together wrong. See why I'm puzzling so much!? The Chainring is mounted on the inside of the spider already so I can't see how I can get it any nearer at the moment unless there's someway of mounting the chainguard inside too and then mounting the Chainring on top of that?
Dunno. I more puzzled than a Monkey Puzzle tree doing a tricky Jigsaw in the dark.