G'day everyone! Later this year we intend to visit Scotland (with a short layover in London). We both have iPhones and would like to use these for Geocaching (to back up our GPS) whilst travelling around Scotland for a few weeks. We need some advice as to which provider/sim card/pre-paid/whathaveyou we should pick up to make this possible. We will be using a lot of data (Geocaching app, as well as various other apps such as Facebook, weather, banking, etc) so need to find a good sim card to use that gives us a few weeks worth of data; to be frank use of phone and sms would be limited so the main thing is the data.
Are there any recommended service providers with good data plans, for temporary use? Good coverage, esp travelling through Scotland (doing Edinburgh, then driving over to the Isle of Islay, down to Glasgow and return).