Marshall,
I had a VMC 144 SA embossed Coca Cola and while that is a rare machine, it is not desirable to most people due to it's size--too big and weight--400lbs. That being said, it is likely a bit more rare in the UK. I bought mine for $200 and considered myself lucky being able to sell it for $275. Mine was complete but needed to be rewired and needed some compressor work. If you are buying it to enjoy and not interesting in flipping it for more money, you should restore it to your liking and enjoy the machine. After restoration, you will have more money into the machine than you will be able realize at sale.
A lot of the 144's are being converted for other uses. My friend considered buying mine and converting it into a gun cabinet. Several have been converted into speakeasy doors to secret rooms. I wish I would have kept mine for a secret door.
Cheers!
Tim