For anyone in or around London, for today and tomorrow there is a popup shop on Oxford street selling raspberry pis
https://www.raspberrypi.com/news/the-raspberry-pi-store-pops...
https://www.raspberrypi.com/news/the-raspberry-pi-store-pops...
> Raspberry Pi 4 (2GB, 4GB, and 8GB) will be in stock at the pop-up. Please be aware that we’re limiting Raspberry Pi 4 to one of these computers per person. Note that the limit is one of any, not one of each, so you won’t be able to purchase one 2GB model and one 8GB model — you can only buy one of any of these computers. We’ve decided to do this to try to ensure that everyone who has made the trip to Oxford Street can pick up one of these harder-to-come-by boards.
EDIT: They are sold out of 8GB Pi4 and Pi 400.