Workers at Denby Pottery have been told they are to lose ten per cent of their pensions.
The move comes as the pottery company swtiches from a 'defined benefit and contribution scheme' to a 'group personal pension plan', which will see less returns for workers.
A spokesman for the firm said many companies were switching to such schem
es because people were expected to live longer nowadays.
The new scheme means workers at the factory, which produces ceramic homeware, will now have to pay into individual schemes, rather than a group pot.
Linda Salt, public relations manager for the firm, said: "Employees will only get 90 per cent of the pension they are owed from the old scheme. With the new scheme they will get 100 per cent as that is their own money that they have paid in.
"It doesn't mean they will lose their pension, they will get it minus ten per cent. It's their own scheme for their own interest.
"Anyone about to retire will still get the old pension."
The ten per cent being lost will be a combination of personal contributions and what the company paid into the pension fund.
A man who claimed to be a worker from the factory, but wished to remain anonymous, said the announcement came out of the blue.
In a telephone call to the News office he claimed workers were called in to meetings on Thursday afternoon and were told what was going on.
He said : "People are obviously not very pleased about it.
"There's a lot of people that have worked there for many, many years.
"People have been there 30 years and some people are very upset."
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