Delbourt

That is interesting thank you. However, there was no way I could position a ring spanner of the type suggested on one of the nuts (the lower one if I remember correctly). The other was accessed by a series of socket extension bars from the off side wheel arch.
My recollection was that beneath the water rail pipework access was limited to somewhere between 2 and 3 inches only.

Do you intend to retain the wheel if you get the nuts off? Or is that scrap?
No immediate solution comes to mind but the Irwin grips mentioned in #2 must be a good bet.
If the wheel is scrap that might open up other possibilities although as said nothing obvious.

In doing that what is the risk of deleting or damaging (altering without intention) the map itself please?

Well now!
I had one with the car that worked and one that didn’t. I bought a second hand fob and programmed all three successfully with Pscan. All three were given new batteries.
Roll on 12 months.
The fob that came with the car was used to drive the car for about 2 hours and parked up. In trying to lock the car with that fob the door button went up and down. Eventually it locked. Back at home (with hearing aids in!) I can hear two actions with the door lock one the big button on the door and something else clicking in the door.
I don’t have that issue with either of the other two fobs.
Explain that?

My experience here is with a Vauxhall 2L “red top” engine .
After re building the engine if fitted after market hydraulic tappets that came in a plastic box filled with a fluid of some sort.
Due to various delays some fluid was lost before installation.
One tappet was a right little problem and never did get better regardless of the number of oil changes and flushing agents used.
But changing the oil did quieten the rest down.
So, in conclusion what have you got to lose?
If it doesn’t work, put a flushing agent in and change the oil again, then “back to the drawing board”.
That would be my approach.

As I understand it the VVC engine does not have variable lift but variable duration. In some way that might be similar as presumably varying the lift at any specific point before or after top dead centre by varying the duration is effectively the same.
That potential variation appears to be well over 10 degrees, so from a mechanical point of view it would appear that a small difference in timing belt alignment is ok.
Doesn’t solve the issue but…….

It is wrong to assume but presumably re programming the MEMS3 and thereby affecting the interaction with ring around the ignition switch has no effect on the “burglar alarm features”?

Great, got that now, thank you all.