Thanks for your question.
There is no law which can compel the person to pay the mortgage. There is a contractual one contained in your mortgage agreement obviously in which you undertake to repay the mortgage.
The liability in mortgage is joint and several which means that the lender can enforce arrears against either of both parties regardless of who is in the view of either party responsible for the arrears.
If you default then the lender will repossess the property sell it for what they can and then sue you for any loss and the fees they have incurred. This should be enough to convince either party to comply with the repayments, at least it should where that person wishes to remain legally solvent.
You may consider getting a solicitor to write to the other party and outline this to them to remind them of their responsiblities and conseqeunces of default. It would cost around £40-50 for a simple letter.
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