What was the last volcano to erupt in the UK?

Answer 1

For England, The most recent volcanism in England occurred in the early Paleogene around 50 to 54 million years ago. During this period the volcanic Lundy Island in the Bristol Channel was formed.

Other recent volcanism occurred in what are now the islands off the western coast of Scotland such as Mull, Ulva or Staffa. There is also a mountain on Mull known as "Ben More" which is the remnants of a volcano from the period in question. The name the 'Staffa Group' is given to the olivine tholeiite basalts found in the vicinity of these islands which erupted between 55 and 58 million years ago. The volcanic activity in question was caused by a mantle plume.

You could also visit the northern coast of Northern Ireland where the "Giant's Causeway" a series of interlocked basaltic columns is the result of volcanic activity of roughly the same age as that which generated the Staffa Group rocks off the coast of Western Scotland.