Hello there!
the costs are averaged out per head over the group; the more people come, the cheaper the cost, obviously. There are 24 places; we found in April that 17 was a comfortably large group, so around 15 is ideal.
Currently, the total cost per head if you were to join the group would be £50 accomodation for the weekend (and no subsequent additions) , I would ask for a £15 non returnable deposit (it's our bank account that's taken the cost!), with the balance payed on arrival - which allows for any lowering of the costs any last minute additions might make, as happened in April.
Let me know if you're interested!
Should be a good time for stones and merry making whatever the weather.
Cheers
Tim