That route was devised in 2005, and since then the Northern Horse Route has been developed to avoid the busy road (A628). But it’s still not very exciting . . .
The Northern Horse Route is ace on a cross bike and can be mixed up with other tracks/paths that aren’t the Longdendale Trail to make quite a neat local loop. I wouldn’t travel to ride it, but it makes a nice local loop and the scenery is stunning.
You can also extend it up along the Longdendale Trail, cut over to Dunford Bridge, thread your way off road to the bottom of Holme Moss then cut up – mostly off road again – to the Isle of Skye road, drop down to Marsden from their on the Pennine Way then back over to Hollingworth on the Pennine Bridleway.
But I’d take issue with your ‘not very exciting’ comment, it’s nice riding and all the nicer for being unexpected and shrewdly routed to avoid a horrible stretch of road. I lived in Glossop for almost 20 years and it’s one of my favourite local trails. And it’s even legal…