Summer 2024 Recruiting

Hi all, 
I'm a North American student who is transferirng to the UK and looking to recruit there for the summer of 2024, specficially London of course. I was wondering if someone could give me a run down of the recruiting timelines and processes of the BB, top tier ones like GS and MS. Along with a rundown for some of the PE and Pensions/SWF (if they take interns), would be very helpful to know all the relevant timelines and if the process differs than that which exists in Canada and the US. 

Also, semi-related, I hear about Mayfair a lot, which big firms have an office over there?

thanks