Abstract1. At the last IUGG General Assembly at Berkeley, California I read a paper which was a joint effort by Commander Suthons and myself on the subject of mean sea level changes around the coasts of the British Isles and the possible significance of these changes. Since writing that paper we did some further work in which we attempted to separate vertical movements of the land (crustal movements) from those of the sea. This was briefly mentioned at the same meeting and was illustrated with slides but has not yet appeared in print.