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If you have a mortgage on your property then it will be registered against the legal title of your property at the Land Registry as a charge. This will prevent you from transferring the property without the consent of your mortgage company.
If your brother can now demonstrate sufficient income to the mortgage company to receive a mortgage offer from them then he could buy you out of the the property so that you the property is transferred over to him and you are released from the mortgage upon transfer. You would have to speak to a conveyancer about this, almost all local solicitor's practices will be able to help you.
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