However this isn’t simply staff choosing not to work overtime, it’s a form of industrial action with the union officially advising all members to refuse rest day working, so I think it’s very fair to claim this is down to a “refusal to do rest day working”
So it just happens that all staff members, many of whom would choose to voluntarily do overtime previously, have stopped through choice, and aren’t in any way influenced by the advice of the union they are a part of?
Are you also suggesting that they will also continue to refuse overtime after the industrial dispute is over?
An assumption of some degree of RDW seems to work fine for other TOC’s (and this isn’t the correct place to argue about it, but to claim this is purely due to the choice of drivers without any influence from industrial action is incorrect)
Should other companies who also rely on rest day working say a similar thing and cut back their timetable because their drivers may, coincidentally, all refuse to do any RDW?