Thousands of British Gas engineers are to stage five, 24-hour strikes in the run-up to Christmas and after the New Year.
GMB union leaders have agreed stoppages for 12th, 19th and 21st in December, and for the 6th and 9th in January, in a row over plans to close the final salary pension to new staff.
Out-of-hours calls will not be handled on 12-23 December and 4-10 January,
British Gas’s parent firm Centrica has said its new pension package is one of the best on the market. However, the GMB union has accused the company of breaking a deal it struck two years ago.