Just one final word about the 'volunteers' - dong forget that a pilot whose trip was cancelled as a result of the strike would lose their allowances of maybe £300.
Given as that quite a few FO's on long haul will take home less in a month than the 3 most senior Cabin Crew on their cancelled flight AND have training debts of £50k+, I don't really think getting those allowances for acting in a CC role is too beyond the pale, do you?