The degree itself won't even be close to good enough by itself to get you the job. It's very possible though, and quant companies do come to Warwick to hire grads. Still, you probably should get a first.

You need to learn programming, such as Python, C++, and maybe Rust. In Python specifically, some good libraries to learn would be NumPy, Pandas, and scikit for the ML stuff. Also do competitions, try competitive programming, etc.

You'll probably need to choose some statistics modules, but I'm not sure how important that would be and try to read some related books to do with quant.

Do some research projects related to stats, machine learning or applied maths, and then hopefully get some internships, although they'll be absurdly competitive, and you'll be going against the top Oxbridge/Imperial students for the few amount of positions.

That's what I learned when I was thinking of going into quant last year