If you were continuously owner occupiers since you bought the house, no CGT is payable. What you choose to do with the money afterwards isn't relevant.
I've never owned a nice new car either and being a petrolhead I do understand the appeal. But I don't think I ever will buy one. Depreciation on brand new cars is savage. Why don't you look at buying an immaculate 1-year old car from a dealer? You'll still have a warranty and the car should be as good as new - just some poor mug will have taken the initial depreciation hit.