Due to the fact the UK is on a craton we pretty much don't need to worry. Saw an interesting Horizon pro ga few years back which suggested that a big chunk of one of the volcanoes on The Canary Islands will break off and slide in to the Atlantic and, that this will devastate the Eastern seaboard of the USA. We might get a 10 ft wave.
Half of the USA wiped out whilst we get some decent waves dude........... cool .