Pegasus computer, Science Museum, 2000.

Tandy Radio Shack TRS 80 I personal computer, 1980.

Code-breaking at Bletchley Park, 1943.

Block of 36 penny lilac stamps, 1881.

Mainframe computer at the VAT office, Southend-on-Sea, Essex, 1970s.

Sinclair ZX 81 microcomputer, c 1984.

Apple I computer, 1976.

GRiD Compass laptop computer, 1982.

Mainframe computer at the VAT office, Southend-on-Sea, Essex, 1970s.

Babbage's Difference Engine No 2, 1847-1849

Fleming's oscillation valve, 1904.

Internet switch, 1996.