Just finished an action/adventure novel by James Rollins, The Doomsday Key, that talks about the Egyptians reaching what is now UK prior to the Celts getting there. His bibliography refs Kingdom of the Ark by Lorraine Evans in support of the idea (although, of course, Rollins takes it to the extreme in his novel). Just goes to show that we are all mutts, when it comes right down to it. . .