Selling car: best payment method?

[Bowler]

I know this a very basic question, but I'm after some real-world advice, in the modern world

I'm about to put a car up for sale. It will most likely be a private sale, so what is the safest way to get payment? It will be £15-£20k

I'm thinking bank transfer only. No cash apps or similar, just a straight transfer into my account?

Is there anything else?
Is a transfer reversible after I've got the funds?

Obviously, I want to avoid cash and cheques of any kind, so is there anything else I should avoid?

Sorry for the simple questions, but it's years since I've sold anything

[Bowler]

Thanks for all the detailed replies.

You've basically confirmed what I already thought so, it's reassuring to also learn the extra tips.

A pal got taken on his doorstep by a couple of guys turned up to buy a playstation and only wanted to pay through cash app. Naturally he didn't get paid......