Thanks Dave, using Royal Mail business CRL service so all items have a QR code for tracking but it's not required by Royal Mail for the post worker to scan the item so it will only be scanned/marked as delivered on eBay if the QR code is scanned.

If we mark the item as shipped at 8pm today on eBay my worry is does ebay then say this is DAY 1 so the expected delivery date would be one day sooner than if we had marked it as shipped one minute after midnight on the actual day RM will process it.