I imagine anyone under age 40, and/or those captains with the "right" type rating/friends with the chief pilot will be "invited to apply" from Bristow and the rest will be binned off/sent to Nigeria/ABZ
This is what happened when Dancopter took Shell from Bristow.
TUPE seems pretty easy for employers to wriggle out of these days, eg
https://www.edp24.co.uk/news/pilots-...ter-job-781170