Can't find a single match to my Royal Grafton Tea Cup?

I thought I'd mention that the little crackles you mention are actually crazing of the glaze, which is tiny cracks in it. This sometimes does happen when china is old. I don't think Royal Grafton is still in production though so far Royal Alebert is- a lot of British china firms have been put out of business by cheap imports so quality china is getting harder to find. Good luck with finding a matching saucer - you might pick one up from the sites in the other replies. If youreally want detailed inf about your cup you could send a photo to the City Museum in Hanley, Stoke on Trent, UK. (The information you have given here is unlikely to be be sufficient)