Aargh! Please stop perpetuating this urban myth bollocks.
You choose a ‘decent’ charity by investigating those that catch your interest and getting in touch with them.
I’m sorry if I offended you, but living where I do & having to deal with chuggers & do gooders that get paid for their efforts, maybe deserved, maybe not, I’m a bit cynical.
I personally want no pay or expenses for my time, just for it to go to a worthwhile cause, preferably to OAP’s, & there are so many OAP’s that need simple stuff doing, but seemingly no outlet to help them.