I would suggest you do everything you can to continue paying the loan. Get a job, and if necessary renegotiate terms with the bank (although it seems unlikely you'll get better terms than a BBL). On that point I believe the original BBL terms were repayable over 6 years but I think you can extend for 10 years by agreement with your bank.
There are ways of writing off debts but they will almost certainly ruin your credit status for 6 years or more. Even a debt management plan (DMP) will affect your credit status. This will affect any new business you want to start, and if you go for employment may even curtail opportunities in many jobs especially banking, insurance and so on.
Do take advice from a debt adviser, preferably CAP, StepChange or another charity. But try to avoid anything like a DRO, bankruptcy, IVAs if at all possible.