Cheap Tesco Mobile SIMs + Free Credit

[SuperPP]

Tesco have their PAYG SIMs on offer, plus if you transfer your mobile number you also get £5 free credit:

http://www.tesco.com/mobilenetwork/shop/?page=simcards

http://www.tesco.com/mobilenetwork/help/?page=keepyournumber

Looked around and these seem the best 'low user' SIMs available.