Miy elective caesareans were both booked in when I was 36 weeks.
DS (transverse breech with placenta praevia) was supposed to be booked for ELCS delivery at 38 weeks, but I asked to go to full term so that he could be born in September and not in August. Fortunately, my lovely consultant agreed. He said he had to officially advise me that 38 weeks was the recommended safest option, to minimise the chances of me going into spontaneous labour as it wasn't possible to have a natural delivery, but there was only a mnimal risk in delaying it when I lived so close to the hospital, so he was happy for me to make an informed choice to do that. As the hospital didn't do ELCS bookings at weekends, DS was booked in for, and born on, the first Monday in September at 40+1.
DD was footling breech and also had to be a ELCS. Again, the consultant recommended it was booked for 38 weeks, but I wanted her to be born as close to full term as possible, even without the school year cut-off considerations I had with DS. I agreed to 39 weeks, but that date fell on a Saturday, so she was born on the Monday, at 39+2, seventeen months after DS.
With both DC, I was told to call ahead to say I was on my way, and go straight to the labour ward if I had even a twinge of pain and they would do an immediate EMCS. I only lived 15 minutes away from the hospital and stayed very close to home for the last weeks of both pregnancies, so I wasn't too worried if this happened. Fortunately though, I didn't have any signs at all of going to into labour with either of them, so they were both born on their booked dates (DS at noon and DD one minute past noon!). Both births were such lovely experiences with straightforward recoveries.