As Peter Lilley Said, "There is a Thing Called a Telephone Which Has Been Recently Invented....

... and most foreigners speak English."
From The Daily Mail:
A massive earthquake off Portugal could trigger a tsunami which would wipe out the Isles of Scilly and lay waste to the Cornish coast, scientists said today.
Experts say that much of the south-western British coast including outlying islands would be destroyed by a 10ft wall of water within four to six hours if there were to be a repeat of the Great Lisbon Earthquake of 1755.
Fears of the natural disaster have been raised by the Devon and Cornwall Local Resilience Forum (LRF), which wants an early warning system like those used across Asia and America* to avoid a British version of the devastating 2004 Boxing Day tsunami.
Unless of course the members of the LRF think that the Portuguese are so spiteful they wouldn't ring up and tip us off.
* The early warning buoys are of course NOT "used across Asia and America", they are floating about in the Pacific Ocean. How they tether them to the ocean floor is another question..?