My wife takes antihistamines for itchy skin (as well as moisturiser)... you can buy the shops own branded ones (very cheap from Tesco) look for the ones with 'Cetirazine' - You don't need Piriton, Zirtek etc... they use exactly the same ingredients.
If you go to a Tesco with a pharmacy you can buy boxes of thirty over the counter... otherwise they come in boxes of 7.
Urghh really don't envy you that Miss Bettany, there's not much worse - I suffer from this though mainly after a bath and I know how horrible it can be. I end up with nail marks where I've clawed at myself.
I just thought it was my eczema popping up in a new area!! Think I might go and get some antihistamines today and see if the itching stops! Good thread - hadn't even thought it might have something to do my my Mini Me emerging!!