Chief Medical Officer Professor Dame Sally Davies has previously said that 'bute' poses only a very low risk to humans. She said:
Horse meat containing phenylbutazone presents a very low risk to human health.
'Phenylbutazone, known as bute, is a commonly used medicine in horses. It is also prescribed to some patients who are suffering from a severe form of arthritis.
The levels of bute that have previously been found in horse carcasses mean that a person would have to eat 500 - 600 one hundred per cent horsemeat burgers a day to get close to consuming a human's daily dose.
And it passes through the system fairly quickly, so it is unlikely to build up in our bodies.
More top news
The 5p charge for a single-use carrier bag has had a clear impact on shoppers' behaviour, six months after being introduced.
Pothole-related damage might seem like a minor issue, but the RAC is called out for such issues by thousands of motorists each month.
Oliver Letwin MP, who was in charge of Brexit negotiations for two weeks, tells ITV News what he thinks will be easy and what will be hard.