Was it www.onewayleisure.co.uk? Although his leaflet states his area is Lancashire, Cheshire and West Yorkshire, I am pretty sure he covers Manchester also. We used him when we had a problem with the fridge not igniting, really pleasant bloke who diagnosed the problem straightaway and had it fixed in 5 minutes. He didn't even charge us as he was actually called out by a MHer on the camp site we were on.
His number is 0759 1150521, I think he was called David if my memory serves me well.