IM UK bike route has just been released. It’s available on Tri247 as a google map which seems to be quite poor quality. Here’s a map of the route I made on mapmytri.com
http://www.mapmyfitness.com/route/gb/bolton/991095713231
I don’t know exactly where the loop will start but it will be somewhere close to the reservoir. Click “show elevation” to see the climbs, descents etc…
I’ve just noticed I started the loop at the wrong reservoir, the actual start finish is at the 5mile mark