http://www.priorityclub.com/hotels/u...te_2012/hotels
Book Friday and Saturday, stay Dec 22nd to Feb 10th. £20.12 a night, pre-paid, no refunds etc. Most CP, HI, HIEX and one Indigo, all in the UK are in the offer.
I can't remember whether the 2 rooms per household limit was 2 room nights or two bookings (I booked two 1 night stays last time round).