Much as I agree with the complaints in that report, all the Airport is doing is aping the behaviour of its biggest customers - Easyjet and Ryanair. It's pretty standard behave for a company to exploit its monoply position wherever it can, and I'm sure the regulation of airport fees hasn't extended to baggage carts and car parks yet.
Filton appears to remain forever a missed opportunity. Like the girl you never asked out, it's simply less distressing not to ever think about it again.