Delbourt

Thank you for the suggestion for further clarity.
At this point in time I have three keys each with their respective fobs. All three have been re synchronized using Pscan and all three work.
I can lock the car with the key and unlock it with the fob (any fob - Lucas type).
At this point in time I do not know if I remove a fob from the key ring whether the engine can be started by just entering the key in the ignition and turning it. For other reasons that have no bearing on this topic starting the car is not practical at the moment. I can go and remove a fob from a key ring, insert the key on its own in the door lock and unlock the car then put that key in the ignition and turn it to the first position without attempting to start the car and see what happens.
I'll do that and report back.

Edit
Using what I believe to be the original key (folding type with MG Logo) I removed the electronic fob and placed that some distance from the car. I then opened the car door with the key, put the key in the ignition and turned it to the first position that engages the panel warning lights. That immediately initiated a low level high pitch two tone alarm within the cabin but not the car horn alarm, although I know that works if I open the boot/bonnet without disarming the alarm. With the low level interior alarm sounding the red LED alarm was flashing.
In for a penny in for a pound determined that I would have a quick attempt to start the car with the intention to see if I could just get the starter motor to start turning. So, on turning the key there was no response apart from the continuing alarm total silence from the engine. I'm not even sure now if the fuel pump went through the motions or not I certainly was not listening out for that.