Quit or carry on?

Thank you very much Oopsadaisy12 and emmasnan. I hadn't even thought to try and find out where the dosh goes, and now I've had a look then that's it, I'm out! They literally spent practically all of the incoming funds on wages, which I had an inkling may have been the case.
I'm enjoying having a day home from work today - found out a lot and been quite "involved" on GN and happy I've been able to come to an informed decision about my volunteering

The charity commission should tell you details about the charity, if it is registered. I would want to see exactly what they supported before I carried on.

I work and volunteer for a small national charity and everything is very up front.

Try a website named Charity choice they claim to show you how each charity spends its money. Personally if I wasn’t happy with the Charity I would volunteer somewhere else. There are plenty of worthwhile charities who would love to have you as a volunteer, however, most of the management of the well known ones appear to have hefty salaries.
Good luck!