The trouble with the GM one is there is very little info to go on. It might be ok. It's cheap enough for me to wonder why that is? There is nothing to lose by going to see it but I would approach it fairly cautiously. You never know your luck - maybe they just want to get shot of it before the winter? You can see the reg just about - maybe you could check some stuff out in advance. They only quote mobile tel nos. so not sure quite what sort of place it is.