I don't have any more information on Pererz, but I forgot to include in my last post the following link to a short YouTube film. It is about the discovery of Perez's 109 and its eventual transfer to IWM Duxford. It was made by Wingleader's Simon Parry and Mark Postlethwaite, the creators of the BOB Combat Archive series:
https://www.youtube.com/watch?v=HJqSYV58gY0
Peter