Original sentence: In 2006, it was reported that Central Bedfordshire, Northumberland and the Isle of Wight were the only LEAs still exclusively using the three-tier system
Edited sentence: In 2006, it was reported that Central Bedfordshire, Northumberland and the Isle of Wight were the only LEAs still exclusively using the three-tier system, though all three authorities have since re-organised some of their schools into the two-tier model in response to parent and school preference