Workers at consumer goods giant Unilever PLC (UL) in the U.K. are preparing to strike for the first time on Friday in protest against plans to scrap the company's final salary pension scheme, U.K. trade union Unite said Wednesday.

More than 2,500 employees will walk out and mount picket lines at sites across England including Purfleet, Port Sunlight, Warrington, Leeds and Manchester, it said. Unilever employs around 7,000 staff in the U.K.

Unite said the strike will hit production of some of Unilever's key personal care and food brands including Dove, Marmite and PG Tips. The company was unavailable for comment on the logistical and financial implications of the strike.

Last Monday, Unite said it balloted over 1,600 members across nine Unilever factories, as well as the company's research and IT staff. Members of unions Usdaw and GMB have also voted for strike action, it added.

It said Unilever's plans will lead to pension losses of around 20% for the majority of its staff, but some individuals will lose up to 40% of their retirement income.

Unilever, the Anglo-Dutch maker of Ben & Jerry's ice cream, Knorr soup and Bertolli olive oil spreads as well as a variety household cleaning products, said the changes are necessary and final salary pensions are no longer a viable option for the company.

In April it said it was closing the final salary pension plan to existing employees from July 2012. The revised scheme is based on career average salaries and contributions, similar to those offered to new employees since 2008.

Following consultation with employees earlier this year, it has made three improvements and several enhancements to its original proposal, the company added.

At 1551 GMT, Unilever shares were trading down 7 pence, or 0.3%, at 2117 pence, in a lower London market.

-By Simon Zekaria, Dow Jones Newswires; +44 207 842-9410; simon.zekaria@dowjones.com

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