Ugh - if you have a good job and are a competent adult - why are you needing bail outs?
And not the odd tenner but £100's!
How well off THEY are is irrelevant.
"But I’ve already said I manage perfectly fine on my own" no you don't! If you did you wouldn't need them paying your deposits, fees for compulsory courses (which you must have plenty of notice to save for - like everyone else doing the same job).
I suspect your mums worried about the future - if they're quite well off they'll need to fund their own elderly care, that's very expensive.
If you don't need it - pay it back!
"My parents have never ever given me an allowance or anything. I supported myself throughout university. I have never asked for a thing!"
A earlier actions are irrelevant
B not entirely convinced that's the whole truth - if it were you'd be used to being self sufficient and good at budgeting
C "never asked" - that's my sisters stock phrase - technically she doesn't, she just plays the "poor me" card until they offer! She's in her 40's and a mother and STILL relying on bailouts!
On £40k a year you really shouldn't be needing their help. London based or not!
"You are expecting money though. Everytime you tell your dad about an expensive course or tenancy fees, you are expecting a handout." Exactly - it's playing semantics.
If you have savings use THEM for deposits, work costs etc - but I suspect you don't.
If they're boomers that makes them at least early 50's and by the sound of it already retired. Will likely live for another at least 30 years but without earning more money and as I said having to cover the costs of their elderly care themselves. Perhaps there are health or financial issues you're unaware of?
"Your mum has got your number, and that is why she is pissed off at the handouts." Yep that's what I'm thinking too.
"but please let's not pretend £40k in London is the same as £40k elsewhere." Oh please! I get so sick of the "but it's sooooo expensive in London" crap. Every major city in the country is more expensive to live in than the surrounding areas and in other parts of the country the wages are lower too so there are millions of people dealing with high living costs relative to their income. Plus there's millions of others living in London on MUCH less with dependants too.
"It always amuses me how people from priveleged backgrounds claim they got where they are all through their own hard work." Quite
Ahem
digitalsynopsis.com/inspiration/privileged-kids-on-a-plate-pencilsword-toby-morris/