Got an update for this one and it isn't good.
DPF sensor is likely faulty and is going to be swapped over for new one. The engine thermostat has also been sticking open and not maintaining the engine temp at 90-95 degrees so the car has been over fuelling which has clogged the egr and dpf which are both getting cleaned out. DPF will be cleaned with a solution and then a forced re-gen carried out also.