I received the date I think 5 or 6 days before but I got a call the following day to say there had been cancellations so I could move it forward to the Friday instead of the Monday. Initial c section was 39 weeks 4 days but then was 39 + 1. I assume this may vary at times but I got told I would have my section around 39 weeks
Had mine in January in Southampton, got my date the week before and had him at 39+4 They leave it until very last minute x
My consultant said it’s around a week before. You could always try and call your consultants secretary and ask. They may be able to tell you with it being not long away.