Would Britian be onw country not made up of 3 countrys if?

Well, it might have ended up with a different split--a lot of people forget that the 'celtic' tribes weren't exactly best buddies with each other, and often fought bitterly. (Archaeologists have just found evidence of a m slaughter at Fin Cop hillfort in Derbyshire.)There were already a number of large and powerful powerful kingdoms such as Dumnonia (West Country), and Brigantia (Yorkshire,Derbyshire) which may have ended up splitting the country. The Picts and Scots in Scotland were also a problem for the people living in England at the time; in fact, the Saxons were actually INVITED to England by the Britons, who were anticipating a huge invasion from the north.