For the record, LGW is mainline, just like LHR.
We have a bidding system. Whilst we earn less than our colleagues at LHR, it's not difficult to make ends meet, as long as you live within your means (like any job anywhere). Crew moan about money on a regular basis, but then pop off to the mall or similar the next minute. If you've got your head screwed on, and have control of your spending, it's not difficult, really.
Hope this clarifies.
Gg