People who have bought certain batches of the desserts are being warned not to eat them and to instead return them for a refund.

The bacteria listeria can cause listeriosis. The main symptoms of the illness are similar to the flu - high temperature, muscle ache or pain, chills, feeling or being sick, and diarrhoea.

In rare cases, the infection can be more severe, causing serious complications such as meningitis.

The alert issued by the Food Standards Agency (FSA) relates to the Crunchie, Daim, Flake, Dairy Milk Buttons and Dairy Milk Chunks 75g chocolate desserts, all sold individually.

The use-by dates of concern are 17 May for the Crunchie and Flake desserts, and 18 May for the rest.

The six-pack of 75g Cadbury Heroes desserts - use by 18 May - is also being recalled.

Read more from Sky News:
New picture of Princess Charlotte

Listeriosis is not usually serious for most people, according to the NHS.

But some people have a higher risk of serious problems, including pregnant people, newborn babies, over-65s and those with weakened immune systems.