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From "the secret life of" series by Tim Hunkin. Excellent series from the late 80s/early 90s, this one is about lifts. Part 2 shows the motor room inside the Express Lifts testing tower in Northampton. I've searched for photos on the net, but not found many from inside the tower. The tower was closed in 1997 when Express was bought by Otis. Also, check out the Express Lifts simulation rig that was used to work out best ways for the lifts to respond to multiple calls - this was the transition from relays to microprocessors! Tim Hunkin also has a website that is easily found by the search engine of your choice!