Did you check other airlines? I'm planning to go down to Spain for a week in November and I checked 3 different airlines, Ryanair being one of them. They did turn out to be the cheapest, but not by much and the departure time from Spain was 07.00 in the morning... The airline I expected to be most expensive, was actually close to Ryanair in price.

Edit: Don't forget your boarding pass when you go to the airport, otherwise you have to pay £40 extra. I just checked Lufthansa. They would have flown you from Heathrow to Frankfurt for £87.78, so not much more and I expect the service to be higher.

Stig