Have just found this...there couldn't be a better place for Halloween activities!
Judges Lodgings, Lancaster : Lancaster?s oldest town house, dating from the 17th century. Originally home to witch hunter Thomas Covell
Sat 23 ? Sun 31
HALF-TERM SPOOKY FUN!
Judges Lodgings, Lancaster
Make witches? hats, spooky lanterns and Halloween masks. Mix potions with Witch Demdike, tell scary stories and meet our Celtic visitors to find out how Halloween was celebrated. Booking essential, tel : 01524 32808
This page has lots of inf about Lancaster (scroll down for more about the Judges Lodgings. May be best not to mention that some of the "witches" were hanged...)
I'm also looking at Herts and Beds, if anyone there wants something interesting for the kids at half-term?