Hertel UK has agreed to withdraw all 40 of its non-UK workers from its insulation project at the South Hook liquefied natural gas terminal at Milford Haven in Wales, the company said in an emailed statement Wednesday.

The company was at the center of a row over the hiring of foreign workers which lead to two days of protests at energy facilities across the U.K.

"Following discussions today we have agreed to withdraw immediately all 40 non-UK workers and will be looking to directly employ suitably skilled UK workers, the company's managing director, David Fitzsimons, said in the statement."

"We trust this will bring the unofficial strike action to an end and hope staff will agree to return to work today," the statement added.

Hundreds of contract workers at U.K. energy facilities held a second day of unofficial strikes Wednesday to protest the use of foreign labor by Hertel UK.

-By Lananh Nguyen, Dow Jones Newswires; +44 (0)20-7842-9479; lananh.nguyen@dowjones.com