Yeah, I have been told the quickest way to de-value any model MG is to go away from the original colour for the particular car. The MG fraternity are a bit "anal".
I broke that rule with the last MG I owned, it was the first model MGA 1500, one that I bought in pieces.The first thing I did was crack test the crank, it was ok [but it broke after about 1000 miles].
Any how its market value was nill till about 6months after I traded it on a Honda 450, then they stopped making and importing MGs, which put a rocket under ALL MGs. My bad timing struck again!
Any how the old Wolsely 680 was probably the best tow car I had. Cheers pancho.