Gave the BRZ a bit TLC and a wash with this fresh paintwork cleanser I got at the weekend https://www.racshop.co.uk/glossworkz-gloss-booster-and-paintwork-cleanser-16-oz.html
Really sorry to hear this mate. As kdyjas said just use it to run the mrs over and claim on insurance, job's a gooden. But yeah, to answer your question more seriously I reckon you'd be able to get about £10k easy.
Has anyone else on here had an issue with the air filter before? Barely pumps out any air at all when I put the air con on for some reason. Is there a DIY fix for this? Thanks guys.