The Town That Went South — Clive King

This brilliantly original and humorous book from the author of Stig of the Dump tells of how the whole town of Ramsly became adrift in the Channel. It was Gargoyle, the Rectory cat, who first noticed that something very odd was happening in the town of Ramsly... The Railway Station was awash, and Gargoyle’s favorite hunting grounds outside the town seemed to somehow become submerged in swirling, choppy, salty water. Then, one by one, as the people of Ramsly woke up, it was discovered that their town had come adrift from the rest of England... they were all floating gently across the Channel into France! But their journey has only begun—Ramsly continues floating south, to Africa and the South Seas, to Australia and farther south to the coldest land in the world.