I managed to repair the point so the next stage is the acquisition of a Ruston 48DS class. Researching the loco has been a minefield as the one purporting to be the exact one delivered to Old Mills is in dispute. According to Hornby it is now the
"GOWER PRINCESS" on the West Somerset. However the cab and other details differ from the photo I have.
So! I have ordered a Hornby model with the fully enclosed cab and will buy another body if more information turns up.
After all I have a get out clause.

It is the similar successor!