Gas

Regulator Ofgem is proposing to introduce a small levy on all energy bills to ensure customers don't lose out if their energy firm becomes insolvent.

Some energy customers with prepay meters could save an average of almost £120/year by switching to one of the two cheapest new fixed-term tariffs.

The energy firm Co-operative Energy has been wrongly charging customers who want to switch to another provider up to £60 to leave, even though they're in the last 49 days of their contract and should be able to switch penalty-free, MoneySavingExpert.com has learned.

MoneySavingExpert.com is warning people across the UK that we are in no way associated with energy cold-callers representing a company called Money Expert.

As many as 2.1 million households have been hit by large late bills in the last year because energy suppliers initially undercharged them, according to estimates from Citizens Advice.

More than six million households switched energy supplier in 2015, a 15% rise on 2014, according to new figures from energy watchdog Ofgem.

A company called The Big Deal has partnered with The Sun newspaper to run a collective energy switch, and the Great British Collective switch is also offering cheap tariffs on a regional basis. But how do the deals stack up on price and customer service – and how do they compare with MSE's own Big Switch Event 4?