Not on the NHS site they don't..

Listeriosis - NHS Choices

The listeria bacteria has been found in a range of chilled ‘ready-to-eat’ food, such as:

* pre-packed sandwiches,
* pâté,
* butter,
* soft cheeses such as Brie or Camembert or others with a similar rind,
* soft blue cheese,
* cooked sliced meats and
* smoked salmon.