'Designed to be difficult to understand'

A group protecting consumers' rights has written to watchdog Ofgem to complain about 'extremely concerning behaviour' by energy firms.

Consumer Focus said the big six firms offer 'confusing tariff behaviour and unclear price rises'.

The move follows a slew of electricity and gas price rises in the past month.

Adam Scorer, from Consumer Focus, says information on websites is sometimes presented in such a way that it is too complex to understand.