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@whg
thanks for your reply. i was not aware that there were different tapers on the bb spindle. (yes, as you can tell, it's my first build!)
the bb is a shimano one i picked up on
ebay and the crank is a sturmey archer fct 46:
Shops selling the crank say that it needs a spindle length of 110mm, (which is what my bb is) and needs a 'square taper', does this mean JIS or ISO?
Sheldon Brown says:
If you install an ISO crank on a J.I.S. spindle, it will sit about 4.5 mm farther out than it would on an ISO spindle of the same length.
which halve the distance i'm getting, so i have feeling my crank needs a ISO spindle, but this doesn't feel right as the recommended bb by sturmey archer is a JIS!
Apologies for the mass confusion and bad writing, any suggestions/pointers would be greatly appreciated.