most dealers will if its approaching a new quarter will agree to redo the order if the ap goes down. get it in writing though.
although not many have gone down recently.
as rox says you can order from any dealer to get the deal that suits and then get it serviced locally.
i was all prepped to go all the way to scunthorpe as for 24 hrs they were doing a deal on bmws for 0 ap, so almost went for an i3 but the morning i was going they pulled the offer as they hit their target. a couple of contributors to the forum did manage to get a deal, jammy sods lol.