Hi Peter,
that all makes sense, I don't think there would have been a "make do and mend" issue if an order was made to withdraw and scrap the trials rifles - they mostly had very different bodies to the standard No.4 Mk1 so no amount of adding parts or tinkering would have brought them within spec.
I would have liked Mr Skennertonto have added any information as it's his book which quotes the order, but perhaps another day.
Thank you very much for taking the time to help with these clear answers.
Curly