I plan a 3 week sojourn in the UK. Does anyone have any recommendations with regard to provider ? Can I buy a sim card at Heathrow Airport on arrival ? Telephone calls using Skype, moderate browsing and moderate email are planned. Would 2 gig be sufficient for 3 weeks ? What would be the approximate cost ? I am confused by all the plans and offers on the various web pages I have looked at with every provider "pushing his own barrow" so would appreciate any help in making a choice or any other experience fellow travellers might have to offer.