I just saw another article that this ban is going to be extended to vacuum cleaners over 900 watts in 2017.
That effectively means that 99+% of current vacuum cleaners will be banned.
They also say that 30 household appliances could be restricted next year, including kettles, toasters, lawn mowers and hair-dryers.
While vacuum cleaners can be improved such that there is more suction per watt, it is technically impossible to improve the energy efficiency of most cooking appliances without using another source of heat besides electricity.
For example, a 1.5kW kettle takes twice as long as a 3kW kettle to boil the same amount of water, so even though it uses half the power consumption, the accumulated energy usage will be the same, i.e. absolutely no energy saving. It's similar for a toaster - reduce the power of the elements and it'll take longer to toast the bread.
As for hair-dryers, well let's just say that there are going to be a lot of unhappy ladies out there complaining about how long their fancy new hair dryer takes to dry their hair.
Basically the end result in many cases is wasting people's time with appliances that take longer to perform, with little to no energy saving.
Edit: Interesting comment on the BBC article: