Weatherall I think Clair is currently on a planned shut down (ie not pumping oil) in order that masses of subsea infrastructure can be installed. I'm not sure of the current schedule though and when start up is. While some of the platform personnel will not be needed during shut downs, masses of project personnel plus fabricators and 3rd party engineering, procurement, project management and installation contractors will be working on this.
I can't imagine BP or any other operators not working when they could be just to help a political campaign.