Damn!
Just read this after having the same trouble a couple of months ago, pulled it off completley and threw it, where the heck do I source a new one!!!
At least I know I can run without it and my car won't catch fire!
My MOT is not until June so I have some time to find a solution. I do wonder how strict they are on this, as I'm pretty sure there are a lot of cars running out there with heat shield pieces missing.