I apologize for this ridiculous question. I have little knowledge of European history. The following is a passage from Charles Dickens' *A Child's History of England*:

"But the Phoenicians, sailing over to the opposite **coasts of France and Belgium**, and saying to **the people there**, ‘We have been to those white cliffs across the water, which you can see in fine weather, and from that country, which is called Britain, we bring this tin and lead,’ tempted some of the French and Belgians to come over also. **These people settled themselves on the south coast of England**, which is now called Kent; and, although they were a rough people too, they taught the savage Britons some useful arts, and improved that part of the Islands. It is probable that other people came over from Spain to Ireland, and settled there.
Thus, by little and little, **strangers** became mixed with the Islanders, and the savage Britons grew into a wild, bold people; almost savage, still, especially in the interior of the country away from the sea where the foreign settlers seldom went; but hardy, brave, and strong."

Are the strange people mentioned here Celts? The book goes on to describe the people of Britain after the migrations mentioned above and how they loved horses. Aren't horses associated with the Celts?

The book makes no mention of the Celts by name.