Possibly you might manage an upgrade to something in between like a Suzuki Swift Sport however.

Good call on the Suzuki SLO, cracking little car, and while it is outside the OP's desired sub 8 seconds 0-60 time, it isn't by much at 8.7 srconds. That £10k budget would get you into one of the last of the n/a models (the current model uses a 1.4 turbo), such as this 2017 car with under 9k miles,

www.autotrader.co.uk/classified/advert/20190301542...1

A former colleague of mine (around the same age) had a similar 'itch' to get rid of his (older) 1.4 Fiesta (90hp) because he wanted something 'faster' but better on mpg. I actually found out why he was getting bad mpg - he was gunning it at 90mph down the A1 to work.

Needless to say, a short time later he drove into the back of a van coming out of our company car park, wrote his car off (not broke, just too expensive to fix, given it was over 10yo) and 'upgraded' with his insurance money to a Megane (I think) TD for about £6k - £7k. Of course, that means he spent several thousand buying it and subsequently will have to endure a big bump in his annual premiums, all because he wanted to drive a lot faster and didn't pay attention.

Just a salutory tale to our OP to think very carefully before going down this path, as (as SLO and elekie&a/c doctor says) even without a claim, the insurance at their age will be VERY expensive even if they have a few years no claims behind them, and just one fault claim could make the next premium unaffordable, meaning they'd have to seel the car immediately, and probably well below market value, losing a lot in the process.

OP - Be careful. I'd personally waut until you're 25 before thinking about a change. premiums should then start to drop more, especially if you stay claim free.