With a bit of effort EZY could change the LGW schedule to release 1 or 2 320's. Taking them off the shorter frequent services, Malaga, Palma etc and making these routes all 319, or 320 at popular times.
LGW needs the greater capacity. It is more lucrative for the airline to have the plane flying out of London to AGP etc. than anywhere else.
The onboard sales from LGW will also be fantastic, probably only matched by MAN.