I can't even pin it down to a family. Possibly one of the Tinea sp, but it has the feel of Elachista and some Gelechiids. I don't suppose I'd be allowed to dissect it?
George did suggest an Elachista, which is the line I was going down. I've gone through the BOLDsystems website http://www.boldsystems.org/views/taxbrowser.php?taxid=6588 but can't see anything that matches there, so as the specimen is long gone, it will have to be left undetermined - unless someone has a moment of inspiration of course!
PS. The MOGBI Elachista key takes suggests maculicerusella (=monosemiella), but visually this doesn't seem right!
Did the key include the genus Biselachista? Could it be something like Biselachista albidella?
Don't think so, but I'll check this out...