Thank you - think I found them not long before you posted.
Its getting there, the one thing now, is I had 3 custom fields, one for colour, one for bra size and one for Brief size.
I've done the edits as detailed in this post for the Colour field, and this works brilliantly!
But, Now in the cart, I cant see the detail for the Bra Size or Brief Size that has been chosen?
Does the prow->customfields that has been commented out show this?