UK - Findus has tonight admitted that it has been selling packs of its popular frozen lasagne that were 99 per cent horsemeat. The news is the first time that it has been confirmed that horsemeat contamination of products sold in the UK has spread beyond beef burgers. There are concerns that the horse meat used in the lasagne contained the drug bute, which is a known human health risk. Findus was today unable to say how long horsemeat has been used in its products.