The new owner bought the flat after it was repossessed but the locksmith/Joiner (possibly?) who gained entry during the Repo butchered the front door ASSA lock and the NorDan Multi-lock systemon the back.
He has removed both to cover up the mess.

The only other info I can give on the multi-lock is that it has 3 shoot bolts one of which is where the lockcase is situated.