This is new to me: phone call at 0052
woke me inviting me to "say 'Yes' to accept the call". My telephone provider is investigating and it appears the company concerned is '0800Reverse'. More here -
http://forums.moneysavingexpert.com/...d.html?t=55367
Beware! Whether it is a good idea to email them with your number and ask to be 'blocked' I'm not sure. Waiting for response from my phone company.