Newbie here, so I hope you don't mind me adding my two penn'orth. I'm local to Bollington so I nipped up to Adelphi Mill this evening to take a look. The boat that's for sale is the one that appears in the top most photo i.e. short cratch, windows fore and aft and a central porthole. There are a couple of day boats there as per the lower pictures i.e one normal window and two roll-up ones. I should add that although The Duck shows this as a private sale, the contact details are actually for Bollington Wharf.
Ricco, if you are thinking of taking a look at this boat, then the 392 bus from Stockport to Bolly is a beautiful route meandering through the back lanes and criss-crossing the canal. If you caught it, then you'd have had a lovely ride even if the boat turn out to be no good!