Been away for a day or 2.
The wall removal was part of a 'proposed' driveway creation at tenants expense. I quote below from my initial letter to the tenants
Drive
A concrete or tarmac driveway, if not built correctly, will potentially reduce the value of the property. If problems developed with the drive, you would be liable for this cost at the end of your tenancy. As that liability for cost is shared with your guarantors, I could not approve such a construction without their written agreement.
An alternative would be a gravel drive. It would need to be excavated to 200mm, compacted with a vibrating plate, then filled with 150mm with plain gravel. After re-compacting you will have around 75mm to fill with whatever scalpings you decide to finish the drive with. Providing you adhere to this specification I would have no problem with you doing this work.
Access
Subject to an approved drive being constructed, then I have no problems with the rear wall and fence being altered to allow access, providing suitable gates are obtained.
I should add that I have not claimed for the drive - the actual construction consisted of the rubble from the wall laid on soil & a scrap car parked on top.