The boss of Tesco has unveiled measures to avoid another horsemeat scandal, including buying more British meat and conducting its own tests.
The horsemeat scandal has taken a bite out of the processed meat market according to the latest supermarket sales data.
As Birds Eye remove three products as a precautionary measure, a look at previous products removed from sale after horsemeat tests.
A statement from the House of Commons Environment, Food and Rural Affairs Committee said:
– Commons Environment, Food and Rural Affairs Committee
The evidence we received from retailers and food processors in the UK and Ireland suggests a complex, highly organised network of companies trading in and mislabelling frozen and processed meat or meat products in a way that fails to meet specifications and that is fraudulent and illegal.
We are concerned at the failure of authorities in both the UK and Ireland to acknowledge the extent of this and to bring prosecutions.
We are dismayed at the slow pace of investigations and would like assurance that prosecutions will be mounted where there is evidence of fraud or other illegal activity.
MPs have condemned the slow pace of the investigation into the horsemeat scandal, with no prosecutions six months after the problem was first identified.
The Commons Environment, Food and Rural Affairs Committee said the authorities in both the UK and Ireland - where horse DNA was first discovered in processed beef products - had yet to acknowledge the scale of the illegal activity involved.
The committee called for assurances that the authorities will act if evidence is uncovered to support criminal prosecutions.
We have started the year on track, despite a continued difficult economic environment for consumers.
This is notwithstanding our planned work on general merchandise, which has held back sales in the UK, and a small but discernible impact on frozen and chilled convenience food sales due to the customer response to equine DNA being detected in four products.
The outcome of three months of checks for horse DNA and the anti-inflammatory drug bute in processed food are expected today.
The regime of the investigation was agreed by EU ministers in February, including 2,500 random tests on processed food for horse DNA and 4,000 for bute.
The move comes as the Government announced it was launching a wide-ranging review into the horse meat scandal to restore consumer confidence in the food they buy.
The results of the investigation are expected to be declared in Brussels, at 11am UK time.
One hundred kilograms (220lb) of horsemeat imported from Hungary and labelled as beef has been identified in Lancashire, with 40kg of it already sold to the public, the Food Standards Agency said.
Supermarket chain Aldi has announced that a random sample of its 'Oakhurst Frozen Meatloaf' had been found to contain horsemeat.
An Aldi spokesman said: "Aldi has been contacted by the FSA to alert us that a random sample of our Oakhurst Frozen Meatloaf tested by a local authority has been found to contain horse meat.
"We are surprised and deeply disappointed at this news. Our DNA testing, carried out last month in accordance with FSA guidance, also tested samples of this product and found it to be clear of horse meat.
"The product is not part of our main range of everyday products and was stocked on a limited availability basis. However, we have immediately withdrawn any of the remaining stock from our stores.
"We will continue to test products and if we have any reason to believe the meat content is not correct, we will continue to act immediately in the interests of our customers."Customers can return the frozen meatloaf to their nearest Aldi for a full refund."
More than half of consumers have changed their shopping habits as a result of the horsemeat scandal, a survey for consumer group Which? has found.
It also found that public trust in the food industry has dropped by 24%, with 30% of those polled now buying less processed meat and a quarter (24%) buying fewer ready meals with meat in or choosing vegetarian options.
The results of the survey comes as supermarket giant Tesco announced it had withdrawn a line of its frozen meatloaf after tests revealed it contained between 2% and 5% horse meat.
Populus surveyed 2,064 UK adults online between February 22 and 24.
Many of the UK's biggest food firms and supermarkets have recalled beef products since January after tests found they contained horse DNA.
A first wave of tests found horse DNA in products including Aldi's special frozen beef lasagne and special frozen spaghetti bolognese, Co-op frozen quarter-pounder burgers, Findus beef lasagne, Rangeland's catering burger products, and Tesco Value frozen burgers and Value spaghetti bolognese.
A second wave of tests revealed contamination of Asda's chilled beef bolognese sauce, beefburgers, minced beef and halal minced beef sold by Sodexo, which supplies food to schools, care homes and the armed forces, and a Whitbread Group lasagne and beefburger.
The third round of tests revealed contamination of Bird's Eye Traditional Spaghetti Bolognese and Beef Lasagne, Taco Bell's ground beef and Brakes' spicy minced beef skewer.
Furniture retailer Ikea also withdrew wiener sausages in the UK last month after tests found "indications" of horsemeat, and it also withdrew a batch of its traditional meatballs.
The company said it was removing the sausages from sale in Britain, France, Spain, Ireland and Portugal after tests confirmed "a few indications of horse meat".
Tesco has withdrawn its 'Tesco Simply Roast Meatloaf' from sale after it tested positive for between two and five per cent horsemeat. It is the fourth Tesco-branded product to test positive for horsemeat.
Tim J Smith, Tesco Group Technical Director, said: "Today we have withdrawn from sale a product which has tested positive for between two and five percent horsemeat.
"The product is a frozen Tesco Simply Roast Meatloaf 600g. The product tested was manufactured between October 2012 and January 2013 at Eurostock in Craigavon, Northern Ireland.
"Tests on 15 other lines from the same manufacturing site were clear of horsemeat. Our investigation to thoroughly understand the source of the contamination has started and we will complete our investigation before deciding whether to continue using the supplier.
"As part of our new DNA testing programme we have now tested more than 500 products identified as being most at risk of containing horsemeat. This is the fourth Tesco-branded product to have tested positive.
"We are very sorry that we have had a further product which has failed to meet the high standards we and our customers expect."
The Food Standards Agency will publish the results from the first wave tests for horsemeat in retailers, food chains and catering companies that supply schools across the UK.
The tests come after traces of horsemeat were found in school meals served by Leicestershire County Council.