durham or a (technically another) gap year and apply to lse and ucl

i have an offer for politics at durham and while i am happy i cant help but to think that i should have applied to the london unis for a different course like anthropology, as i feel theyre rlly similar and i wouldnt get much more out of doing a politics degree than an anthropology one. as im contextual, i feel like i would have a decent chance (idk) at getting offers but i just dont know whether it would be worth it to take a gap year. if i took a gap year, i would be 20 at the time of starting because i had to take a one-year gcse course as i had missed secondary school due to mental health issues and didnt complete my gcses. i feel like it would be difficult to connect w people more so than it already is for me and idk what id do in that year; it just seems wasteful to me when i could be doing something and not pushing myself back another year. i also live in london and so it would be easy for me to commute in second year or something and i could come back home very easily as opposed to durham which is like 4 hrs away from me lol. people also just view london russell group unis in a v positive manner compared to other places and its stupid but i keep thinking that maybe it would be more beneficial to study at one of them than somewhere else and i cant help but feel an overwhelming sense of regret due to this,