It is important that the London Electricity Board was run by the government until
the energy market was deregulated hence you now have the choice of choosing one of the 6 main electricity companies for you energy supply and its just really a case of finding the cheapest one prices.
In order to lower your energy prices in London you don't need to use your current supplier and if you are on a standard tariff then it is entirely possible that you can save money by switching to a different supplier or a different tariff. Its really simple to do this and you could save up to a few hundred pounds a year. All you need to do is use a comparison website and then get an instant online quote where you can compare all the different types of tariff and choose the one that suits your needs the best. You then choose the tariff you want and get big savings!
In general switching between the different companies that supply London electricity is very easy. The new company which you switch to would do all the paperwork and the switch is done pretty much automatically.
You can generally save more money if you pay your bills by monthly direct debit and there are incentives for people to do this. Further discounts can be made if you sign up for prices online and not having a paper bill.
It is important to remember that the prices in the wholesale market fluctuate and that it is good to keep an eye out for what the energy suppliers are currently charging as this may change. Therefore any of the energy suppliers may be the cheapest provider for London electricity at any given time.