Railway overtime ban announced by train drivers union

There is likely to be disruption to trains during the first week of July as train drivers will refuse to work overtime.Many of the train companies are dependent to some degree on train drivers offering to work overtime to fill gaps in the timetables. However, unlike say a national strike where you know there will or won’t be trains on a set day, an overtime ban could affect services at random times, causing confusion for passengers for the whole week.
The overtime ban is being called by AS