From the retailer:
We are recalling a batch of this product as a precautionary measure as a small number of packs have been found to contain pieces of a hard plastic like material. If you have bought this product please do not eat it.
Product Code: 45004 (All GB regions) and 75744 (Neston region only)
Batch Code: 10101701
Best Before Date: 09/04/2019
Regions affected: All regions except Ireland.
Customers are advised to return the product to the nearest store, where a full refund will be given.
Further information can be found here.