The sea levels would definatly have been lower 4000 years ago making the islands more prominant from the mainland. Today they are very hard to make out unless you know where to look. Were they seen as somewhere safe to bury the dead, away from your enemys who might descicrate the graves on the mainland? Were they seen as a mystical land inhabited by gods who would look after the dead.
And nobody has mentioned Lyonesse, where did the varous legends originate? This fabled land that is now under the sea somewhere of Lands End must have its origins somewhere....or is it all just a load of romantic rubbish?
Mr H