A 999 year lease will certainly sort you out, and it means of you come to sell in 10 years you still have 989 years left

Do you know who the freehold is?
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That's a relief
Be a bit like when I retired, many said the wheels would fall off but I guess they didn't. Once you turn the page it all becomes irrelevant.
Say, What?
There's nothing wrong with wanting to occupy your mind, otherwise you have too much time to dwell.
It's called coping, you can't possibly ignore the nightmare you've been through, all you can do is move forward one day at a time and keeping yourself busy, keeping your mind occupied, is the healthiest way to pass the time.
This depends on your circumstances I guess, if you can get your job back then it's a brilliant safety net but you need to work out if you really can't cope, or are you panicking because you've had the rug pulled out from under you and are feeling insecure. Could you try again in the future?