Just to put a sort of benchmark on salaries, my 22 year old daughter is a newly graduated Physiotherapist, working 5 days a week and one weekend in four in the NHS based in Epsom. Her gross is 22k. She lives in Clapham in a house share (£110/week + bills) and doesn't run a car as she can get everywhere she needs to either on public transport or by bike.
She takes home around £1200/month and hasn't asked for any help yet
My other daughter who is 20 pays £426 for insurance on a Corsa. The AA figure for running a car includes depreciation. You don't need a new car.
If people don't want to do the job, they needn't apply, if they all start leaving after 6 months or the GPMs are rubbish then BA may have to up the salary.