I have a 3 number. 9 pounds a month and also doesn't cost me anything extra to use when in a number of euro countries and US on holiday. They have a deal with a number of countries whereby you just use your phone as usual at no extra cost.
Near Goldstone valley the signal is pretty patchy as I've just found outI've just looked at their site, and the normal £7 deal is 250 mins. It seems they use Vodafone, which (according to the online signal site thingamajig) is good in some parts of Hove, not so good in others.