That’s a hell of a commute. 🙁
The A6 from Stockport up to Whaley Bridge (or vice versa) can be a car park sometimes.
There’s some good riding over that way, it’s easy to get over into the Goyt Valley. Road riding from there is excellent, MTB is a bit more piecemeal and some of the Goyt stuff is footpath.
I think the Hayfield Hub lot still go out from Hayfield – search for Hayfield Hub on Facebook.
I’d say there’s more/better MTBing over Hayfield, New Mills, Rowarth, Marple way but that’s all close-ish to Buxton. Or if you want a bit of a ride, park up in Marple or New Mills and ride the rest of the way to Buxton, it’s mostly canal towpath then a bit of road. Perfect for a CX bike.