What a ridiculous rule - i think some midwives make things up to suit them, my SIL had a sweep at 40+3 with her second daughter - she had 3 in fact on 3 consecutive days. I've been so lucky so far and only had the lovely midwives, although maybe i just look hormonal and scary.
Friday will be here before you know it and at least if you are that bit overdue it had moer chance of triggering something. xx