Hi Northy. I too had a friend who retrospectively fitted cruise to his VW Passat without going through a dealer, just an indicator stalk and a bit of wire. Slightly more tricky than that but you know what i mean. Although the Bmax has the cruise within the steering wheel, I figure if it can be done it will be more tricky than doing the indicator stalk. The Air bag and stereo controls all runthrough the squib behind the steering wheel. Unless you can find someone who knows for sure this can or can't be done, I would look behind the wheel first to see if the wires are actually in place before proceding any further.
1.6 tdci, remapped to 120 bhp, Panther Black Titanium with rear view camera, nav pac and front sensors. Always willing to stop & help in any situation I can. Karma is a beautiful thing.