However, I'm not at home right now and the roaming charges are outrageous. Forget about data (25 MB for 2 EUR?) and the voice also isn't something to write home about.

Btw, UK HNers: could someone of you recommend data SIM of about half a gig, but one that is valid for one week and then I can forget about it? The operators I tried to ask were not happy to offer something non-recurring.