LLU is the shortened name for Local Loop Unbundling
In simple terms BT have an Exchange, which is where Broadband comes from. Before LLU BT were really the only suppliers of BB and so the price was fixed as other ISP's were forced to rent the equipment from BT.
Companies like Orange have now rented part of the exchange from BT and put their own equipment into the exchange. Now that ISP's have their own kit in the exchange they can effectively change their pricing as the costs should be theoretically cheaper. This technology that LLU uses effectively is better than BT's as it can deliver faster speeds.
