At this stage, it depends on your Mortgage Lenders stance and how aggressive they want to be. If you have missed a payment or even part of a payment under a suspended possession order, you have broken the possession order, and your Mortgage Lender can apply for eviction immediately.
Depending on your specific case, your Lender may claim the agreement or possession order is now cancelled and that you now need to clear your arrears in full. This is not necessarily the case, and your ability to stop further action will depend on your circumstances and how fast you can catch up on the missed payment.
If you have broken the Court’s Possession Order by a matter of days and can pay the monthly payment within the same month that the payment was due, then your Mortgage Lender should not be putting you under pressure, as it is a regulatory requirement that this is acceptable.