Originally Posted by bstrummer

Thank you - I shared this with Josca. His reply as follows:-

Aha!
Thanks.
A minor detail but it may have significance for the relationship of the position of the rear axle further forward in relation to the position of Simplex derailleur.
I think the cap nuts are long gone, and not something that's easy to find so I will recheck your box of parts.
Simply reversing the screws would do the trick to use up space in the dropout.