Horsemeat scandal: Pub giant Whitbread announces its food contains horsemeat Pub giant Whitbread confirms it found horse in its burgers and lasagnes But Tesco says 149 other beef products it's tested are clear of equine DNA Food Standards Agency has tested 2,501 beef-based products and found 29 samples containing more than one per cent equine DNA Downing Street accuses retailers of keeping customers 'in the dark' Burgers in Northern Irish hospitals withdrawn as they contain horse Staffordshire scientists found wrong meats in 9 out of 15 beef samples 'In beef we found chicken, lamb, pork and horse,' Dr Frank Hollywood said The biggest hotel company in Britain has admitted burgers and lasagnes sold in its pubs and restaurants were laced with horse meat. Whitbread PLC, which owns Premier Inn as well as the Brewers Fayre and Beefeater Grill pub chains, made the admission on the day supermarkets also revealed which of their beef products were contaminated. We sent 30 products to be tested and received the results of these tests on Thursday. Two of these products tested positively for equine DNA and we immediately removed them from our menus', a Whitbread spokesman said. Meanwhile Lancashire Country Council has confirmed it found horse flesh in the cottage pies it delivers to 47 local schools and will pulled them from the menu. Scandal: A lab in Staffordshire testing beef products says that nine out of 15 samples in one batch contained horse, as well as lamb, chicken and pork in a scandal linked to abattoirs like this one in Romania The Food Standards Agency said today it had tested 2,501 beef-based products and 2,472 had come back negative for horse meat. There were 29 samples containing more than one per cent equine DNA but all these products had already been announced by supermarkets, the FSA said. The food watchdog had promised that all 'value' beef-based meals would be tested by today. But in fact the 2,500 results released this afternoon only represent 25 per cent of all those on the shelves, and these will trickle in over the coming days and weeks. Environment Secretary Owen Paterson said today he'd like to see all tests on horse meat carried out by next week FSA director in Wales, Steve Wearne, said it was 'impossible' to ever know the full extent of horse meat mis-labelling. What we have in these set of results is a snapshot of what has been on the market and provided by wholesalers, by caterers, by retailers in the period between January, when this story broke, and now. 'We don't have any reliable information on what might have gone on before January 15.' Under-fire retailer Tesco will be relieved after it revealed this afternoon that it did not find any equine DNA in the 149 products it has tested since it found last month that some burgers and meals were contaminated with up to 100 per cent horse. Meanwhile a lab carrying out official tests on beef products sold in Britain found more than half of samples contained significant amounts of chicken, lamb and pork, as well as horse. Staffordshire County Council, whose scientific services team is helping with the investigation, said today that nine out of 15 portions tested were contaminated with meats that should never have been there. The local authority's lab in Stafford has been analysing items like frozen burgers, meatballs and ready meals favourites lasagne and spaghetti bolognese. It came on the day supermarkets will be forced to reveal whether many more of their products have been laced with horse flesh. Chief scientist at Staffordshire's lab, Dr Frank Hollywood said: 'One survey of 15 samples found horse in two but other species as well. Nine of them had some type of other meat. In beef products we found chicken, lamb, pork and horse. Findings: Dr Frank Hollywood, from the Staffordshire lab helping test beef, found contamination in 9 of 15 samples (right) Duncan Campbell, a former president of the Association of Public Analysts and one of Britain's most senior food inspectors, said that today's test results would provide a 'snapshot' of the UK's contamination problem 'I think there will be still more discoveries to be made,' he warned. The more people have looked for horse meat, the more products have been found containing it. I don't think we have got to the bottom of it yet. The food chain is very long and at any time there are ingredients and products progressing from the farm to the supermarket shelves. What we will have today is a snapshot of when these samples were taken, but it won't necessarily give us the whole picture just yet.' Meanwhile burgers containing horse meat have been supplied to hospitals in Northern Ireland, it was revealed today. David Bingham from the health service's Business Services Organisation, which provides meat for the health trusts, said a range from a company in the Republic of Ireland had been withdrawn. 'We have acted immediately; as soon as we got information there may be a confidence issue we withdrew the product,' he said. Investigation: A police van leaves Boddy's Abbatoir in Todmorden, West Yorkshire today, after the owner Peter Boddy was arrested last night Arrested: Slaughterhouse owner Peter Boddy has been held by police, after being accused of passing off horsemeat as beef Red carpet: Dafydd Raw-Rees with his wife Sarah-Jane and daughter Rhian at a ball in Abu Dhabi last November. He is believed to have been arrested. Probe: Police arrested Peter Boddy at his slaughterhouse in West Yorkshire, pictured, which was raided by police and officers from the Food Standards Agency this week Downing Street today attacked supermarkets for keeping the public 'in the dark' over the horse meat scandal as more products were pulled from the shelves. Today it was revealed slaughterhouse owner paid to kill animals badly hurt during the Grand National is one of three people arrested by police investigating how beef products became contaminated with horse meat. Peter Boddy, 63, is accused of fraudulently selling equine flesh for use in kebabs and burgers sold in Britain, the Food Standards Agency said today. Aintree on Merseyside, the home of the world's most famous horse race, has confirmed it sends fatally injured horses to Mr Boddy's slaughterhouse in Todmorden, West Yorkshire. Last year's fallen favourite Synchronised, ridden by legend A.P. McCoy, was put down at the site, and an Aintree spokesman said last night: 'We are as confident as we can be that no unfit meat reached human food.' It is understood that Dafydd Raw-Rees, 64, and Colin Patterson, 42, of Farmbox Meats, based near Aberystwyth, have also been arrested. Mr Boddy has been accused by the FSA of providing horse carcasses to their company, which were subsequently processed and passed off as beef. Under pressure: Greencore in Bristol was named in the ongoing horse meat scandal after traces of equine DNA were found in beef bolognese sauce that it sold to Asda Job: A worker pushes a container before filling up a dumper truck with blocks of meat at French meat processor Spanghero's factory in toulouse as a French inquiry into how horsemeat got into ready meals sold across Europe continues The scandal first broke a month ago when routine tests by Irish authorities discovered horsemeat in beefburgers made by firms in Ireland and Britain and sold in supermarket chains including Tesco, Britain's biggest retailer. Only this week Tesco admitted the "minced beef" in its frozen bolognese is up to 100 per cent horsemeat. The value range ready-meal was made by Comigel, a French firm also linked to contaminated products at Findus and Aldi. Horses slaughtered in Romania are thought to have been used by Comigel to make meals distributed across Britain and Europe, raising fears the problems are more widespread than first thought.