@lewisbartlem I’m in the same boat as you. I’ve just started studying Automotive Engineering with Motorsport at the University of Hertfordshire. In my 3rd year I do a year placement which I will be aiming to do with an F1 team.
The main thing I think teams look for is passion. I was fortunate enough to be able to spend a week working with the Williams F1 Team and I got in purely through a letter I’d written to them highlighting my dream to work in F1 and my immense passion for the sport. Obviously, engineering knowledge is important too so make sure you choose GCSE/A-Level subjects and a degree that are related to F1, like I did!
Also, if you are going to Uni, see if they enter Formula Student. It’s a massive competition where a team of students designs, builds and runs a full racing car. Ross Brawn is a patron and attends the UK competition at Silverstone every year. Geoff Willis is also a regular visitor.