Gale-force winds of up to 100mph uprooted trees and sent debris flying across streets, while tens of thousands of homes were left without power.
Storm Eleanor caused widespread flooding with the latest pictures showing floodwater engulfing Irish towns and huge waves crashing through the doors of a gallery in Cornwall.
More than 55,000 properties in the Republic of Ireland and 20,000 customers in Northern Ireland lost power after bearing the brunt of the storm.
A 25ft to 30ft harbour wall section in Devon and Cornwall collapsed and was swept out to sea after being battered by the Category 1 storm.Related articles
Steve Parsons / PA WireA sea wall partially collapses in Portreath, Cornwall, after Storm Eleanor hits it
There are also fears thousands of pounds of art are ruined after Porthminster Gallery, St Ives, was hit by 80mph winds.
Cornwall has been battered by Storm Eleanor with families stacking sandbags against their front doors in desperation and damage estimated to run into millions of pounds.
Large waves also surged in other coastal areas with pictures showing Porthcawl Lighthouse in Porthcawl, Wales, being lashed by the high seas.
In England’s South-East, a “large number” of trees fell across major roads, according to highway crews, causing