If you do not wish to pay interest then you need to work before you go to university and save to pay your fees or use the Open university and work to pay their (lower) fees. Support yourself for 3 years (earn more than the figure Student Finance suggests, possibly 8.5k currently but check) and you'll be deemed to be independent and will then get grants based on your own income. As this is likely to be below the levels for full grants/bursaries you can probably cover your fees with savings, a summer job and perhaps an interest free loan. Or get married and you'll then be deemed to be independent but you won't have the savings to fund fees.
No-one has to go to university, it's a choice. Even then no-one has to go at 18. The government loans money if you wish to take it, you are not compelled to do so. Sensible British students would work for three years then go.
Anyne who thinks muslim banks dont get more money back than they give out is deluded. They don't call it interest and that makes it acceptable to imams, merely showing that they recognise their religion is unworkable. You probably pay out more than with other banks. Any scheme the government introduces will use a similar form of weasel words but will ensure you pay for your education.
Muslims can't expect special treatment for their religious beliefs but the government wont like the prospect of students delaying and hence getting more public funding so they'll come up with something that pretends not to charge interest.