I ferried mine from Mikes at Easy Bee in Gloucestershire to Staffordshire on 19th May.
Terrible weather!
Fine when I picked 'em up, but chucking it down from the moment I joined the M5, to when I left the M6 at Stafford.
I put them on the hive stand, and gave them 5 minutes to get used to the stillness.
The hive entrance was blocked up with a strip of foam; I gently slid it out from one end, whilst sliding some bits of grass into the other end.
That way, the bee's were not able to rush out, and get lost.
By the time they had pushed the grass out, they knew that they were in a different place, and commenced orientation flights.
John