dont know if this link will work , but basicly unlimited data and all calls included for £1.99 a day
http://www.o2.co.uk/o2travelupdate?...avelupdate-_-A000912218-_-findoutmore-_-05778
http://www.o2.co.uk/o2travelupdate?...avelupdate-_-A000912218-_-findoutmore-_-05778