1 The lift testing tower was built by the Express Lift company in 1980.
2 It was opened by The Queen in 1982.
3 It's built of 4,000 tons of reinforced concrete.
4 The tower was designed by architects Stimpson and Walton
5 Broadcaster Terry Wogan dubbed it 'The Northampton Lighthouse'. The name stuck.
6 The circular tower is 127.45 metres high (taller than Salisbury Cathedral). The diameter is 14.6 metres at the base, tapering to 8.5 metres at the top.
7 The lift shafts were designed to test lifts travelling at up to 7 metres per second.
8 The upper part of tower has a distinctive pierced jagged shape aimed at reducing the vortex effect.
9 The Express Lift company closed after being sold to another lift manufacturer, Otis, and the last 500 workers clocked out on Thursday 30th January 1997.
10 The tower became a Grade II listed building in October 1997.