A toxicologist from Leeds University has played down claims from Labour's shadow environment secretary Mary Creagh that the drug phenylbutazone causes cancer in humans.
Professor Alistair Hay said there is "no convincing evidence of carcinogenicity".
More top news
There was no White Christmas but here's a look at the best Boxing Day snow scenes.
Actor Dustin Diamond allegedly stabbed a man in a bar in the US after getting into an argument on Christmas Day.
Over the next 24 hours we are going to see snow and ice across many parts, although it is looking calmer from Sunday onwards.