There's no need to act impatient. We don't sit around on AB waiting for questions to turn up, you know.
If you think carefully about this, you will see this as a non-starter. The implication of what you are suggesting is that you buy the property off the landlord. To do that, you will have no choice but to pay property transfer tax (1% up to �250k, 3% above that, assuming less than �500k), use a solicitor or similar to help you with the transfer and fork out for surveys etc.
If the landlord defaults the lender will of course repossess - and want to sell for as high a price as possible - but in a difficult market. You cannot just assume that selling price would be the same as the outstanding mortgage on the landlord's loan.