Thanks guys for your replies, did try all sorts including the straw taped up to the Henry Hoover. Gave in, in the end,truly well beaten by my stupidity.
I feel like that old character on tv many years "Frank Spencer". Everything I seem to touch goes pear shaped.
Defeated I had to eat humble pie and phoned jaguar and ordered a new ignition barrel, but I've been told it will match my existing keys(which is one blessing)
Cost £232 just for the part. Heaven knows what's it going to cost in labour charges by my mechanic. Expensive mess up.
Im not much better at diy either come to think of it. Reminds me of a few years ago I was taking down an old brick outhouse. One of the walls collapsed and the Mrs was standing a foot away from where it all fell.
Now she has to periodically check on me if I do anything nowadays lol
Cheers again everyone.