Due to listeria concerns, the UK has recalled these Cadbury chocolates. See the list here:

The company Muller, which produces desserts under the Cadbury brand, announced the recall of a 75-gram package of chocolate desserts with the date of use May 17–18 written on it.

The use-by dates of May 17, and 18, and 75-gram packs of Cadbury chocolate treats have been recalled.

Listeriosis is a dangerous infection brought on by Listeria monocytogenes, according to the US CDC.