You will need to arrange your own accommodation, below are two suggestions:

Lancaster city centre

The Penny Street Bridge Hotel
Email: relax@pennystreetbridge.co.uk
Tel: 01524 599 900

CEH Lancaster is located on the Lancaster University campus.

The Lancaster House Hotel is on campus:
E-mail: lancaster@elhmail.co.uk
Phone: +44 (0)1524 844822

See http://www.citycoastcountryside.co.uk/site/lancaster-city for alternatives and other information.