Zierer is the company that has built the "Knightmare" at which Lancashire theme park?
Zierer:  The company also has partnered with Schwarzkopf to build "Lisebergbanan" at Liseberg and "Knightmare" at Camelot Theme Park. Camelot Theme Park: Camelot Theme Park is an abandoned resort and theme park located in the English county of Lancashire.
Camelot Theme Park