I inherited 480K cash, what should I do, in my situation

I have inherited 480K cash, I am 55, I have a vey good salary (slightly less that 100K a year).

I am single, no partners, no children, no debts. I have a simple, inexpensive lifestyle and intend to keep it that way (but I want to get a dog). I live and work in London, and enjoy very much my work.

I don't own any property in the UK. I live in a not great, rented flat for 1500 a month in London zone 4. But in 10/15 years I will want to leave the the UK and retire. I don't want to retire now, I enjoy my work.

Should I buy a property? A house? A Flat? Or should I would invest? Or both?

Thanks for any advice, this is my real (very fortunate) situation.

EDIT: I have 500K in my pension funds, I have been putting 4K a month in my pension fund in the last few years, I can afford it and I intend to continue if I able to.