Apply for one here via the Direct link :
http://www.familymobile.co.uk/freecredit Their is no need to make a top up,to get free credit,and their is no need for you to enter a Ikea Family ID Number, they will send you a sim even if you have not got one.
Price List Here:
http://www.familymobile.co.uk/infopages/uk-price-sheetUseful Feature: They are the only UK Payg network that allows you to divert/transfer your call to another UK number. (9p a minute).