More info: In Brownells catalog #60, pages 362 and 371, are 3 different scope mounting systems by XS, CadTechnik, and Williams, specfically for Enfields. One of them should work for you. The CadTechnik doesn't require any gunsmithing if you have a No.4 Enfield receiver. If it's a #3, the XS, Williams, or a S&K mount on page 372 might work.
Hope this helps, Tom
on edit; the one that slipped my mind is B Square.