We use the iPlayer on a VPN from www.my-private-network.co.uk which is very good for a fiver a month. Another advantage of using it it that you appear to be in the UK to other websites too and get around the problem of sites serving you spanish pages automatically - really annoying.
<Rant>
However - the BBC iPlayer is the biggest crock of **** ever produced. It crashes, deletes your recordings, refuses to play stuff and generally behaves like a two-year-old in a tantrum. The Beeb don't care, provide no support and treat you like a moron. It seems that £5bn a year in licence fees doesn't stretch very far. </Rant>