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• A steel wire suspension/cable-stay hybrid, designed by John Augustus Roebling and completed by his son Washington Roebling and daughter-in-law Emily Warren Roebling. Construction began in 1870 and the bridge opened in May 1883, with a longest span of 486m/1595ft and an overall length of 1825m/5989ft. As well as the roadway and pedestrian walkway, it carried a cable railway until 1944 and trolley streetcars until 1950.

Use for: Menai Bridge

• A road bridge crossing the Menai Straits between Anglesey and mainland Wales, designed by Thomas Telford. Construction began in 1819 and the bridge opened in 1826. The longest span is 176m/577ft and the overall length is 417m/1363ft. The original wooden deck was replaced with a steel deck in 1893 and the wrought iron chains were replaced with steel ones in 1938.

Use for: Pont Britannia

• Crosses the Menai Straits between Anglesey and mainland Wales. Originally this was a tubular rail bridge of wrought iron rectangular box-section spans, designed by Robert Stephenson and opened in 1850, with an overall length of 461m/1512ft and a longest span of 140m/460ft. After a fire in 1970 the bridge was rebuilt by Husband and Co.as a two-tier steel truss arch bridge. The new rail bridge opened in 1972 and the upper road level in 1980.

Use for: Wellington Chain Bridge

• Cast and wrought ironwork designed by Samuel Brown (1776-1852) with John Tudor Smith (architect) and James Abernethy (engineer/contractor). Built to connect Ferryhill to Craiglug, 1829-1831. Opened to traffic in May 1831. Cost £10,000. Ironwork replaced by steel in 1930 and bridge restored in 2008.

Use for: Conway Suspension Bridge

• A wrought iron chain suspension bridge designed by Thomas Telford and completed in 1826, this was one of the first road suspension bridges in the world, crossing the River Conwy, with a longest span of 100m/327ft. It is now a pedestrian bridge and is owned by the National Trust.

Use for: Forth Rail Bridge

• A triple double-cantilever bridge crossing the Firth of Forth west of Edinburgh, this was the first major structure in Britain made of steel. Construction started in 1883 and the bridge opened in 1890. It was designed by Sir John Fowler and Sir Benjamin Baker, and built by Sir William Arrol & Co.

Use for: Marlow Bridge

• A wrought iron chain link suspension road bridge crossing the River Thames, with a longest span of 72m/235ft. Designed by William Tierney Clark, its construction began in 1829 and the bridge opened in 1832.