The answers on here are hilarious! Most people I know, if their parents could, have had parental money at some time or another, sometimes for formal stuff like house deposits, frequently for rental deposits, for courses, rent, just because money because it's nice if you have money to share it.
I will be giving my kids what I like, whether my husband pulls faces or not. I think it's very important that each gets similar amounts though, but other than that, it's one of life's pleasures to give money, time or energy to your family, and he likes doing it, so as far as I'm concerned he should carry on. If your mum resents £200 a few times a year, then that's up to her. She sounds extraordinarily tight given their relatively wealthy circumstance- paying for work courses is hardly pissing it up the wall on champagne, is it?
Other things people's parents have paid for that I know of- a car and car rental, holidays, a trip to Ikea with a budget, stuff for their new house, all types of things. That's without going into people who have been bought property, allowed to live at home in London whilst interning, all types of financial legs-up.
Most people do want to help their families including financially if they can, unless they are drug addicts or there's some compelling reason not to do so. 25% of mortgage deposits are from parents, it's a pretty common thing.