Almost a third of UK spending in supermarkets is at Tesco, research on consumer spending has revealed.
The firm is leaping far ahead of rivals with 30.3 per cent of market share in the 12 weeks to June - an 11 per cent surge continuing its consistent double-digit growth during 2005.
The grocery market share figures produced by research firm Taylor Nelson Sofres saw total spend in supermarkets in the three months to June of £17.3 billion - of which Tesco took £5.2 billion.
Tesco, which receives £1 out of every £8 spent in the UK, played down the results.
"The 30 per cent share is based on a very narrow measure of only the major supermarkets and excludes other retailers who sell food such as Marks and Spencers and Boots," the company said.
Tesco's closest rival, Wal-Mart owned Asda, was not much of a threat to the supermarket giant holding on to its 16.4 per cent market share.
The recent restructuring plan undertaken by Sainsbury's appeared to be paying off with the group having 15.9 per cent of market share - up from 15.6 per cent in 2004.
Although still clinging on to its spot of fourth largest supermarket, the troubled Morrisons and Safeway brand was hit hard. The group held just 11.7 per cent of total spend in 2005 compared to 14.1 per cent in 2004 - the first time it has had less than 12 per cent.
Independent grocers have also found their market share slipping away as the supermarket giant vie for a greater proportion of the market.
In the 12 weeks to June 19 independents took £575.7 million - 3.3 per cent of the market, a fall of eight per cent
A spokesman for the Association of Convenience Stores said the Competition Commission needed to look at how the market was operating.
He said: "The way in which the supermarkets are growing at the moment is having a negative effect on independent stores.
"So far we have seen some 2,000 UK stores go out of business over 2004 and 2005."