Sell old weekend car to fund a kit?

[Horseworth]

Hey!
I'm looking to get rid of my old MG TF (bit of a mid-life crisis mobile, but still good fun to drive) and get something a bit more raw and powerful. The MG I have is quite new as far as TFs go (2010) so still worth a little bit lol. I was wondering if I'd be taxed any if I bought this? This salary calculator gives me some numbers but I'm not convinced selling this will be income so really not sure if I pay tax or not, so could use some confirmation before I pull the trigger and stick it on AutoTrader

Cheers!