I wouldn't tell anyone, not even the missus. I'd spend it slowly and very secretly.
I'd finally be able to afford an Albion shirt with a name and number on the back, possibly even the Championship badge on the arms.
I would have some difficulty in explaining the Aston Martin. The answer is probably to go away on holiday to give your brain time to calm down, and then tell people that you have won, but say it is less than it really is.