This morning I went to the UK Online website to look up the support number that we haven't used, and found this message:
UK Online is now closed
Woops. I had noticed that over the past year, the direct debits from our bank account have become more irregular, until they stopped altogether about five months ago. Woot, free Internet! Except I should have investigated a little more closely...
So now I need to do some research on good ISPs to replace UK Online. Suggestions welcome :)