The rubber pad insert on the flip key had been breaking up for sometime and being lazy had just used clear tape to hold the pads in place.
Anyway it came to a point of no return at the weekend as two of the pads had given up working, the unlock door and lock door.
Looking at options there seemed to be three.
Option 1 was a new key including the inners and it would require progaming to the car. Expensive option I think £90 plus.
Option 2 was an empty new fob case. Reasonable cost, £5 to £10. Required you to open current fob case and transfer inners to new case but you could damage the board and transponder
Option 3 was to buy the rubber insert. Very cheap at £3.99 for 2.
No need to open the fob case. Just pull the old rubber out and replace with the new.
I went for option 3.
Just word of warning. Don't remove the plastic insert under the rubber insert as it is a sod to push the 4 pegs back into its holes as the thickness of the new rubber makes it hard to reseat.
I reseated the plastic insert then pushed the rubber into the side gap.
Photo's, hopefully in order, showing how I replaced rubber insert.