errrrm, oh sorry
This (single-country Spain) has been available since about September, about the time that meir posted about free roaming launched by Czech O2, and I thought it was already on here somewhere, but I did a quick search and didn't find it
It is said that there will soon be a pan-Europe version, for £10 a month, but perhaps not other single country choices (apparently Spain is the favourite destination from here).
Ignoring the 25p outgoing rate and using callback instead looks good.