Cadbury is recalling newly released Caramilk chocolate blocks after pieces of plastic were found inside some of them.

The white-chocolate and caramel bar, last sold in 1994, had only just been relaunched by the company as a throw-back product, when on Thursday Cadbury was forced to recall it.

Some blocks may have chunks of plastic inside, the company said. Cadbury is blaming the problem on a "machine fault during the manufacturing process".

"Our analysis of the samples received to date has determined that this product does not appear to pose a serious health or food-safety risk, but a recall has been initiated to prevent the risk of serious injury," the company said.

The recall covers only Caramilk blocks with a best-before date of 17/01/2019 and 21/01/2019.

Consumers can return them to the place of purchase for a refund.