jongeman - re kellycsi - how about Monarch from Birmingham or Thomsonfly from Cardiff?
I would much prefer to travel from LHR and use BA or Iberia, the cost is not much more if you book early and with IB you get a stop over in Madrid for an hour which breaks the journey up nicely.
Thomsonfly does not float my boat and I avoid Cardiff at all cost as I do not like the airport as it feels very provincial, Birmingham is ok but I would choose IB or BA over Monarch anyday.