I've been thinking that buying a ratty car and spraying it with dirt and guano is the cheapest arbitrage out there. Easy money.
Surely Dom the concern is that it DOESN'T make the restorations you have in motion good value... people don't seem to be paying the money for good restored cars, so unless they are being restored to keep as family heirlooms (like my cars admittedly) you are better pushing the car back in a barn and trying your luck at Bonhams in a few years! The way current prices are, it appears the worst thing you can do value-wise to an Aston is restore it???