A tour of the studio (also used for 'Home Front') is very interesting! Different flights of stairs, doors, a kitchen, various underfoot surfaces, and a 'dead room' with no reflected sounds for when they are apparently out of doors.
Also an amazing machine with a huge range of recorded sounds including every kind of animal noise that could possibly be needed! Oh, a stockroom crammed with all kinds of random bits and pieces for making sounds. We also met a producer and a script writer. Fascinating tour.