This is the avenue I am now attempting. I'll let you know how I get on. I might post a picture of the disintegrating key fob - advice from here is always appreciated.
Just had quite a bit off a shock. My keys are disintegrating, the Fob is literally falling apart although it still does work as keyless - for now.
Thought I would see how much a new key will cost me from JLR.
Would any one care to guess?