I think I know what's going on, I think those above who had said their orders were shipped 8:30pm onwards etc are looking at the DPD time on the tracking and not the time when OCUK shipped it?
When say OCUK ship me a part, as long as it hits the cut off time (approx 5:30-6pm) I normally get a DPD email around 7:30pm saying the parcel has been collected and it's on the way to my local depot, but tonight I didn't get the OCUK email until 8:20pm, so DPD had already been and gone by that time, so it'll be collected tomorrow for delivery on Friday.
I'm assuming that OCUK actually shipped your orders earlier in the day at some point?