Bank holiday pay is the sticking point over a strike that will take place on Boxing Day. Tube drivers will walk out on that festive day and 18 and 25 January. It will be the third successive December 26 walkout by Tube personnel, stemming from a dispute which dates back to a 20-year-old agreement. London Underground representative Howard Collins said: "London Underground has a long-standing agreement with all trade unions which covers working arrangements on bank holidays, including Boxing Day."