This is strange. I can do SEPA transfers with Intersango to Germany, and I sent and accepted SEPA transfer even inside Germany, so I can't see why Intersango should be able to switch from a domestic wire to a UK to UK SEPA, it is at least possible. Hm, how much do you need to transfer and do you need to transfer money often, I might open a polish GBP-Account next monday, which I could offer as a pass through.