. After twenty years at the top the bubble has finally burst for Fairy Liquid - after being beaten in value and performance by a discount supermarket own-brand, a report showed yesterday. Consumer watchdog Which? Said family favourite Fairy has been one of the best performing washing-up liquids ever since the magazine first tested it in 1965, and has been number one in every test done since 1991.

But this year, at half the price and with longer lasting bubbles, Aldi's Magnum Premium Original liquid has stolen the top spot, rated best value for shoppers. Part of the family: Nanette Newman became a household name after acting in iconic Fairy liquid advert The Aldi bottle topped the table with a test score of 92 per cent just pipping the Fairy Original which scored 91per cent.

Said Aldi was able to knock Fairy off its perch by increasing the number of active ingredients in its Magnum Premium Original liquid while changes to Fairy Original's formula made little effect. A spokesman said: ' There has been little impact on its (Fairy's) ability to remove fat, but the foam now runs out faster than before. 'When foam disappears, it's people's cue to add another squirt, even if the detergent is still working, so more gets used if foam disappears sooner. ' 'We've also spotted that Fairy has shrunk the size of its Original bottle for the second time in three years.

In 2008 it was 500ml, before shrinking to 450ml the following year. Qtwitter for mac. 'Now it's down to 433ml - but the price has remained the same as last year's despite this change 'We think this is an underhand way of raising the price and have regularly criticised companies for doing this.' A spokesman for Fairy said changes in the formula have made a more concentrated liquid allowing the bottle's volume to be reduced, along with the resulting waste when empty.

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But the results suggest that it's not just Aldi catching up with the top contender. Said: 'We noticed big improvements in most liquids since last year, suggesting it's not just Aldi that's catching up with Fairy.