I have carefully examined all the tariffs offered to me for years. It used to be part of my job for one of the biggest energy users in London. Unfortunately. most people just look at the cost of the energy rather than how the particular combination of energy cost and standing charge effect them. Historically, we have been away a lot, therefore we can accept a slightly higher energy cost for a lower daily charge.
Also, I do not use comparison sites as they falsely calculate what your next years costs will be by calculating your future charges using a proportion of the year on your existing companies standard (most expensive) tariff whilst calculating the one you are switching to on the basis of whatever (usually cheaper) tariff they are offering you over the whole year. Also, watch out for things like cancellation charges which can be as low as zero, but more likely up to £35 per fuel (they are all zero close to tariff end).
Say, like me your tariff ends on Feb 1st. A comparison site will only calculate the tariff you are on up to Feb 1st, then use the companies normal tariff to calculate the rest of the year. Of course they can offer a cheaper deal! So check against what your existing company are offering.
I have been with So Energy for several years now, but their quote was a bit high this year. The only mainstream company that offered a decent reduction was e-On, who worked out £80 less and nearly captured my business until I noticed that the tariff was dependent on me having a smart meter fitted. therefore, after checking through all the offers and figures again, I remain with So, who have a smart and informative web site and excellent customer service.
Mike.X