Commuting from Spain is no better no worse than the LGW guys living elsewhere in the UK have to contend with. You could fly free with NAS from AGP to LGW, but the train home would cost an arm & a leg, even if there was one running at the appropriate time, &. . . if not LGW based, you will not have a car park pass so will have to spend a fortune on parking if you choose to drive in the atrocious UK traffic. Most Spanish based guys living in central/N England appear to use Ryanair/Easy/Thompson or whoever they can find flying close to home. You have the roster on the 16th of the mth, so are booking flights from 2 - 6 weeks ahead. My commute is costing me around 400-500€ /mth in tickets for a 3 hr flt.
As always, commuting is a choice, which most of us do as the lesser of 2 evils , in an attempt to reconcile home life/work. It is easy /free on NAS, but the lack of routes N of LGW in the UK doesn't help. That "may" change at some stage if the (vague) rumour of MCR/LPL comes to pass, but it is not a frequently mooted one (apart from the guys living there
)