Gotta agree with View From the Ground.
I travel LON-AMS regularly, often at quite short notice. Consistently BA are 20-30% cheaper ex LGW than EZ, and KLM or BD 10-20% cheaper ex LHR.
Tried to book LGWEDI with EZ for this morning, returning 2/3...... £35 more than BA's best deal. (both returning on the red-eye).
Probably the exception rather than the rule, but I'll be sticking with the so-called 'Hi-cost' carriers for now.
Cheers
Dixie