The union of Britain with Ireland in 1800 increased the need to improve the road route from London to Dublin and, by this time, Holyhead had emerged as the primary port for sea access.


This led to two major engineering feats on Anglesey: the construction of the world’s first major suspension bridge – the Menai Bridge – which was designed by Thomas Telford to carry a new road from the mainland, and the building of the Britannia Bridge, which incorporated innovative box-girders or ‘tubes’ through which trains ran.