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@jarvist
Thank you liquidsky.
I had a bit of a think & a fiddle with some calipers. I measure the TSA 314 as being 2mm asymmetric (i.e. 2mm longer on the drive side), this agrees with a gif on Sheldon Brown (19 vs. 17 mm): http://sheldonbrown.com/harris/images/ta-bb-axles.gif
Assuming the TA crank taper is ISO, the ideal substitution should be a 113.5 symmetric axle ISO BB (some places seem to suggest it is between JIS and ISO, at which point it would sit closer, I think). I can't seem to find much available in 114mm, so Liquidsky seems to have it right with a 115mm 'triple' ISO! Now to find a suitable BB...