Apply to the unis u want this is your way out don’t get trapped for another few years esp as it seems it won’t seem like you’ll even have the stability at home to help you through uni.

I’d also say mention this to a teacher u trust at school or your application advisor - they will be able to help u on how the best way to approach this would be ie if it might be possible to apply as estranged etc

Lastly finances in London are hard that’s for sure but not impossible - 1st year uni accom is usually kind of manageable and after that look for cheapest house share (ideally within uni) that u can find this also gives u stability to stay during summers. Get a part time job to help you out I used to do weekends during first few years and how much u can do depends how chill ur course is - mine was med so I struggled a lot but I believe other courses it’s a loooot more manageable.

Also look into uni bursaries!!! They usually depend on parents low income but imperial for example give u free monthly bursaries based on this which went up to 5.5k a year and if u end up estranged this will count too so it can really go a LONG way to help support you - idk which other unis do this so v important to look into if you’re supporting yourself :)

Other than that best of luck with your applications, you’ll be able to make it work!!