I know i might go on again.
I booked to go to Cork from EMA in august. and the flight was on special offer, and there was a advert for a £0 special offer flight... when i went to book it was okay, then when came to confirm the flight, I noticed I had to pay a extra £16 just for booking the flight, and then £8 for checking in at the airport as I will have luggage, and then tax and charges and god knows what else, and then it froze, so by the time i got back onto there slow website at the moment, it was a regular flight, i booked it anyway, but that was another £10, so where as I was planning to spend around £20, it came to £37 in the end... even though the atual seat on the plane was £0 and £9.99 on the way back