Thanks for the advice. I tried a spray contact adhesive. That was fun, it was good in parts, but didn't really hold down the edges on Old stiff tolex. I think old school contact adhesive would probably have been a better, less messy option.
I stuck the ragged edges down with superglue. It looks a right dog's dinner, but it was just an old clapped out case, it's all good experience for the next time.