Easyjet Flexi tickets are very good but they do come with restrictions. Changes are only valid on the inbound sector and to the airport originally booked, which is of limited use as Easyjet spreads its services very thinly between GLA and LGW/LTN/STN
Easyjet
GLA-STN Twice daily
GLA-LTN Twice daily
GLA-LGW Thrice daily
British Airways
GLA-LGW Five flights
GLA-LHR Nine flights
I’m not a fan of BA’s new seats but if a fair comparison is to made, they should be measured against Easyjet’s new seats