With the help of a friend who is good at this sort of thing I've just fitted an Edimax BR-6428nC which links to the router provided by Telefonica.  At 9dBi it has a fair wallop but just to be on the safe side he also brought with him a Edimax EW-7438RPn Mini (plug in module) that talks to its 'big brother'.  The result: A strong signal all round the house and outside as well.  He brought them with him from CPC in Preston.  I don't know if they deliver here but Les and his van claim to have a bit of capacity in a few days' time and his journey starts form that neck of the woods.