computing and automotive are very different studies .. and if you have no experience with cars and automotive in general it won't be easy but not impossible!
first how good are you with maths and physics ? write down your grades and all qualification you've achieved till now
then search universities courses in automotive and/or motorsport degrees . some of them are Loughborough, Oxford Brookes, Leeds, Bolton, Coventry, Brunel, Derby.
if you are not good with engineering and science you may consider taking a foundation year as an integrated year prior year 1 of chosen degree, it's really a good choice for many students , search about the benefits of a foundation year.
keep in mind to work in automotive industry is not about what degree you have, it's more about skills and experience, and that's why prestigious unis they don't offer automotive and/or motor sport courses because it's vocational course