Mail on Sunday clarifies 'green tax' claim

In the 'Clarifications and corrections' column in today's Mail on Sunday, the paper admits:

Last week we incorrectly referred to The Queen as the Duchess of Cambridge’s mother-in-law. Her Majesty is, of course, the Duchess’s grandmother-in-law.

Oops. They have also published this:

On September 18 and on October 29 we said the Government’s 'green stealth taxes’ are costing families an average of £200 a year – an increase of 15 – 20 per cent on typical domestic power bills. In fact Ofgem estimates that environmental costs account for 7 per cent, or £100, of the average domestic power bill.

The dates of the original articles is noteworthy because the Daily Mail had corrected the same figures - which it had repeated several times - on 7 September.