My SG BSB is still processing, ordered 08:05...
East Midlands Airport is where Apple Watches are destined to land in the UK (other Apple products too) because it is close to UPS na UKMail's main hubs in Tamworth and takes the most freight out of any airport in the north of England.
A UPS flight from Philadelphia in the U.S landed around 8pm so fingers crossed this was full with lots of Apple Watches!!
Anyone wanting to see this can go here...
http://uk.flightaware.com/live/flight/UPS237
EDIT: Further research on the page linked above shows that UPS237 is a two part flight which flies from Louisville to Philadelphia, then Philadelphia to East Midlands, then returning again in the same sequence. It's been doing the same thing since the 11th April.
Now correct me if I'm wrong but isn't Louisville the central hub for America, Apple wise? Plus the 11th April is when they started flying to East Midlands from Louisville so frequently, sounds about right to start moving Watches around?