Availability of the Apple Watch series 4

I've been meaning to get the Apple Watch series 4 from a store in London in about two weeks, around the 1st of November, but on the website it says the watch will be available at the stores close to me only on November 30th.
I wanted to know, should I order it online beforehand and collect it at the store - will it mean the watch arrive sooner?
Or the arrival date is the same, as it says on the website, no matter if I purchase / order it in advance?

I'll be in London until the 6th of November and I was hoping to get it while I'm there.

Thank you in advance.