Given that I've got window frames that are falling out, plumbing that leaks, a TV aerial that points closer to the ground than to a transmitter, and countless other things I can't currently afford to fix, some house repairs would be top of my list.
Then, as I've only had a couple of nights away in a hotel on holiday (rather than for work) in the past quarter of a century, I'd try to find someone reliable to look after my cats for a while (with a back-up in case they dropped down dead the day after I went away, as happened the last time I did it!) and take a short break somewhere.
I'd also buy a decent secondhand car. (My current one cost me £350 about 5 years ago, has got over 135,000 miles on the clock and might not last too much longer. I wouldn't want anything 'flash' or new; just something that might have a few more years life left in it than what I've got now).
About £10k though would probably be in the post very quickly to the guy whom I think of as my son.