Yeah UCL is competitive. I assume you have at least a 6 in English Lang and maths, but from now focus on the LNAT. They’re big on the essay, they say on their website that most applicants have at least 22 so while they do still put a lot of emphasis on the MCQ, the essay is so much bigger.
I got 23 (When 23 was the average) last year and got an offer, and I got 29 this year (When the average was 21.5 I think) and got an offer - for all it’s worth.