In reply to elliot.baker:
I should have said, as the others have, don't go near cut gate unless it's been properly drought dry or frozen solid. Otherwise the bog of doom sucks.
Regarding routes, there are two other options instead of out and back....
Do a Doctors Gate/ Cut Gate clockwise loop. BUT although this looks good on paper, it has serious drawbacks ( up Snake pass on the road, bits on the A628 road of death, portages on Doctors gate unless youre a trail god, long section of dull longenden trail). I enjoyed it as a long day out but objectively speaking none of the rest was anywhere near as good as Cut Gate. Do a search for my username/Cut gate on singletrackworld for loads more info.
Thete is also a loop using trails and footpaths to the east of the reservoir to get back to Langsett. More details on that post on STW