01355359007
Is charged at local rate and answered almost immediately. It is only for people calling from overseas though and they will question you so you'll either have to be honest get a slap on the wrist and hope that they proceed or lie and say your visiting friends in France or something.
You can only call it from a mobile though or put 141 infront from a landline may work.
Ladies, I have an 0300 number which is for organising overpayments (which I was!) however I got put through to renewals. Well......I got put through and after 10 minutes of info and menus got hung up on because it was busy. It may be closed now but worth a shot!
0300 200 3809