Went round all the door actuators and linkages with WD40 PTFE spray and got them all working on one press of the button. Alternating multiple physical pressing the door to lock button and pulling the interior handle with the doors open to release them, seems to have worked well in freeing off the rear doors, which were occasionally sticking due to lack of use probably. I found that you can spray the front locks by removing the rubber bump stops below the actuators and using the tube on the can through the hole, spray upwards and around. Worked a treat.
