Britain's first “instant” factory to feature the use of GRC precast panels has been erected in Lancashire. Called a Stockshell, it is claimed to demonstrate that system building need not sacrifice high thermal insulation values for its traditional appeal of low‐cost and speed of construction. The savings in heat, outlay, and erection time have been achieved by the use of lightweight Thermacast panels which have a thermal insulation value equivalent to two eleven‐inch cavity walls.