What is the airspeed velocity of an unladen swallow?
Your question is one of the inponderables that plague our world.
I would try to put a time on delivery, but Apple UK runs on a new form of space-time that its not entirely linear.
There is a elite team of physicists working on the problem as I type (somewhere on a base in Wiltshire), but they are not hopeful of ever understanding what relationship 'proposed' Apple UK delivery times have to actual Apple UK delivery times...
Good luck,
Marc
(P.S. It will probably be 1-3 days built time, and them up to 10 Business days for delivery

)