According to Sheldon the TA track bottom bracket has a 111.5mm spindle.
You can get a 110/113mm shimano, or sjs have a 110.5 tange.
Holdsworth should be able to sort you out, but not many shops will have this info.
EDIT - Please ignore some of what I said above! I forgot that you have a geared bike... I don't know what BB you will need to get good indexing on the 5 gears... perhaps to the 115mm Sheldon used?
According to Sheldon the TA track bottom bracket has a 111.5mm spindle.
You can get a 110/113mm shimano, or sjs have a 110.5 tange.
Holdsworth should be able to sort you out, but not many shops will have this info.
EDIT - Please ignore some of what I said above! I forgot that you have a geared bike... I don't know what BB you will need to get good indexing on the 5 gears... perhaps to the 115mm Sheldon used?