In reply to Kieran_John:
I would try thorp farm bunk houses
https://sites.google.com/site/thorpefarmbunkhouses/home
they do accept noisy celebrations but you sometimes need to book two a joining bunk houses which you might need to anyway for 15 of you
there is a brilliant walk / pub craw from thorp farm with some bouldering near by.
our pub crawl from thorp is.
1, Scotsmans pack
2, the fox house
3 Grouse inn
4, Chequers in
5, Miners Arms
6, THe Barrel inn
7, the plough inn
8, the little john
If you have a pint at each its surprising how sober you will be when you get home. all 8 pubs will take about 8 hours for something shorter ( 4- 6 hours) drop the miners arms and the barrel inn
the scotsmans pack to the fox will take you along burbage and you can arrange for the bit past the Chequers inn to take you along the top of froggatt and curbar, all good for a quick boulder / highball.