If any of you have a business or have access to purchase under a company name you can just ring up the store and they will allocate you one.
I've done it and picked 2 up a few hours later. Walked in O2 over the road and got new sims
They keep back units for businesses, you don't even need an account, just give the company name and address and you pay the full amount.
I called up the business dept in my local apple store. The guy who answered knew me and my company from a previous purchases. He kept a 32gb white aside for me. I picked it up later that day. I don't know whether it was because the guy knew me or I was a business customer or both.