I'm pretty sure you just phone the council, tell them "I've just moved into 999 Letsby Avenue and need to pay council tax, my name is Mr I M Notafraudster." I

I'm pretty sure you just phone the council, tell them "I've just moved into 999 Letsby Avenue and need to pay council tax, my name is Mr I M Notafraudster." I could of course be mistaken.