The Executive Director of consumer group Which? says the latest profits show why the Government needs to set up an independent review to look at whether recent price increases are justified.
Richard Lloyd said: "Without greater scrutiny of energy prices, consumers simply will not believe that they're getting a good deal."
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Police and coastguard discovered the bodies of 42-year-old Cheryl Tompsett and her five-year-old son Leo Tompsett on Monday.
It follows a similar move by ministers in Scotland.
A "small number of people" have been treated following a "reported minor explosion" at Southgate tube station in London, police said.