If you favour the bunkhouse option I have found an interesting one, this time just outside Hathersage, and in between both Hathersage and Bamford stations - and there's also a regular bus on the main road. It doesn't look a 'luxury' option by any stretch but seems extremely flexible and group friendly. They hire out sleeping bags. It also has the benefit of having some nice B&Bs on the doorstep for those who do not want to 'bunk up'. There's one that sleeps 14 - cost £140 a night (£10 each).
Thorpe Farm Bunkhouses
I have also found a bunkhouse sleeping 12 at
Clumber Park, which is close to Sherwood Forest. 5 miles from Worksop station. But Clumber Park is an immense parkland to have fun in.
I've found quite a number of bunkhouse type places.