Sorted at last, A QS1221 starter from QX Components, www.qxcomponents.co.uk still lots to grind off I've about 1mm clearance, but its clearance.
I got change out of £55 including next day delivery, a really helpful company well worth a try
A few pics in my archive, a bit big, but this does work, it isn't theory.

[Edited on 23/8/07 by r1_pete]

Well done Pete, good to have a a part number and proof that it fits.