Does it really cost you that much just sat there?

I've got an Impreza sat in my garage that I don't use but it doesn't cost me anything sat there. Being as it's the last of the classic shape and an STI it's gone up noticeably since I've owned it.

I think you've got an opportunity to get good money back for your Cosworth in a few years. Sorn it, work on it when you can, save up for a respray and get it back to OE. Look at it as an investment, explain to the Mrs that it's better than money in the bank. She'll thank you in 10 years when you get £20k for it.