Any one thinking of a Travel Sim this is worth looking at I bought one for 3£ and found it to be preloaded with 2.50£ when I registered it. Their customer service seems good transferred my number with out any problems

http://www.ebay.co.uk/itm/Toggle-Mobile-Sim-Card-Holiday-Calls-2-50-Credit-Free-New-Sealed-Free-Post/161199354309?_trksid=p5197.m2280&_trkparms=aid%3D333005%26algo%3DRIC.FIT%26ao%3D1%26asc%3D319%26meid%3D4481540492678524155%26pid%3D100068%26prg%3D1175%26rk%3D1%26rkt%3D4%26sd%3D161199354309%26clkid%3D4481572968901139334&_qi=RTM1572015