Answer: I can’t help but notice that you sound a little angry. I’m not sure if it is legal for you to blow up your own car, but you might want to think about the insurance implications. To me this sounds an awful lot like “automotive suicide” and there might be a disclaimer for that in your policy. Although it might not be as satisfying, you might just want to sell the car. Alternatively, you could consider having it “sorted out.”
You don’t mention specifically what kind of problems you are having, but all classic Jaguars require a fair amount of routine maintenance. However, before you even reach the point where routine maintenance will keep your Jag on the road, it must be “sorted out.” This process involves repairing anything that is currently broken, as well as tending to areas that are known to be problematic and are likely to cause problems in the future. On a Jaguar of your vintage, many of these problem areas are electrical in nature and repairing/replacing connections, as well as checking and renewing ground connections will likely eliminate some of the problems that you are experiencing as well as prevent future problems.
I would suggest that you bring it to a Jaguar specialist and pay them to listen to your tales of woe, look at the car, and give you their recommendations. They might feel that it’s too much of a mess to repair economically, or they may feel that a few hours of work will alleviate many of your problems. They might even recommend blowing it up.