Lol, at just walk them round.
DH volunteers with the D of E. He gets paid nothing other than £5 daily allowance for meals on exped weekends and a nominal bursery towards training/assessment costs. He pays the rest of the cost towards training, gives up an evening a week for 6 months of the year, pays his own travel costs to get to the group, alongside approx 6/8 weekends a year on practice and assessed walks. Using his leave for at least one of the two 5 day expeds they do for silver/gold assessments. He pays for his own camping and walking equipment, plus funds for evening meal while away.
He has done a couple of paid weekends with other under staffed groups in order to recoup some of his costs, as he can earn approx £100 a day assessing another group.
The costs for his group vary from £160 for bronze to £180 for gold. These costs go towards paying the leaders wage (all other adults involved are voluntary), hall fees, insurance, minibus hire, driver trg, DBS checks, registration fees, camp site fees, equipment, bursaries for training volunteers, bursaries towards under priviledged students etc
If parents object to the fees, volunteer to help out yourselves, or find one of the few groups left who can still subsidise it for little or no cost.