I'm not sure how reliable a metric "likely to stay with current employer is". For European companies with a presence in the UK, employees' sentiment might well be that it's better to jump ship to a more UK-centric company now before the job market gets flooded with employees let go from European companies who decide to move away from the UK.
I can think of at least one company which has stated an intention to withdraw from the UK in the event of no-deal/bad-deal.
Biting the hand that feeds IT
