Karennina,We are flying with flythomas cook.£318.94 for both of us return to bristol,we only booked 8/3/10 when we saw prices that good.
the day before when we looked it was twice that price!
if it was me i would be worried that it could cost another 50pounds each for the extra 5 kilos each!!
Brian is of a different opinion he would take email saying when he booked the price he was quoted included 20kilo and stand his ground.
good luck in what ever you do decide.
Julia