I've just posted a new web-page with questions (and photos) about possible variegated Poncirus seedlings.
Take a look at http://www.homecitrusgrowers.co.uk/poncirustrifoliata/variegatedseedlings.html
Anyone here got any comments? I know a few people have variegated FD, but I haven't managed to get hold of any yet.

Please forgive me replying with nothing sensible to say other than I am so glad to find a really knowledgable UK based site.....it reassures me to know that it is possible to grow citrus in more than an ornamental way here!