Anglesey Sqn Search and Rescue Helicopters, both units providing employment for about 500 civilians. RAF Valley is now the headquarters of 22 Sqn Search and Rescue. There is a wide range of smaller industries, mostly located in industrial and business parks, especially at Llangefni and Gaerwen. These include an abattoir and fine chemical manufacturing, as well as factories for timber production, aluminium smelting, fish farming and food processing. The island is also on one of the major routes from Britain to Ireland, via ferries from Holyhead, off the west of Anglesey on Holy Island, serving Dún Laoghaire and Dublin Port. Much
Holyhead Mail Pier Light Holyhead Mail Pier Light Holyhead Mail Pier Light on Salt Island, Anglesey, is an inactive lighthouse which was built by the civil engineer John Rennie in 1821. It is probably the second oldest lighthouse in Wales, after Point of Ayr Lighthouse and is the last of three lighthouses located on the island. There is a matching tower in Howth, Ireland, also designed by Rennie, for the other terminal of the Irish packet steamer. The lighthouse is of national significance as one of John Rennie's surviving works. He was one of the most eminent engineers of the world's first Industrial Revolution.