Martin Lewis exposes the hidden energy price war that can save you hundreds

Energy prices are tumbling, but only for some people, Martin Lewis has said.

Writing to readers of the MoneySavingExpert.com newsletter , Martin explained: "Surprisingly, as it's winter, energy prices keep tumbling, but only for switchers. 

"Most people who do nothing won't feel any benefit, and as 11million of you sit on dud standard Big 6 tariffs, that's a worry."

In fact, even existing customers can take advantage of the latest British Gas offer - which is it's cheapest deal since 2016 - saving people on the standard rate £300 a year.

However, to get the very best deals the best deals, you need to use a comparison site, he warned.

"Don't just call up and ask, some of the big firms' cheapest deals aren't available that way. They are 'don't click, don't get' deals ONLY available by doing a comparison."

(Getty Images/age fotostock RM)

Martin also offered the following tips for people switching:

• Don't worry - switching is easy.  Some are worried by it, but your supply won't be cut off, no one visits your home (unless you get smart meters) and it's the same gas, same electricity, same safety. The only changes are price and service 
• Still won't switch? Switch without switching.  The best savings are usually from moving firm, but if you really won't, at least get the best deal from your supplier. As we say above, some firms offer cheap deals that allow existing custs to get 'em (as well as newbies). Yet for some, you can't call up to apply, they're only avail via comparison sites
• I keep hearing of small firms going bust - is it safe to switch to one?  It is safe in the sense your lights will stay on, heating will work and any credit you're owed will be returned. But the risk is you'd almost certainly lose a cheap tariff  
• Will I need a smart meter?  All the Big 6 (not others above) require you to have smart meters installed within 3mths to get their cheapest deals. If you don't, you'll likely be kicked onto more expensive standard tariffs unless you can't get them for technical reasons. Don't worry too much, you don't pay to have them installed
• I live in Northern Ireland. Can I get these deals?   Unfortunately not. No UK comparisons include NI, but see Cheap NI Electricity or the Consumer Council for Northern Ireland's tool .