Blockbuster UK was separate from the now dead (?) US chain for many, many years. About eight years ago they basically focused on selling rather than renting, and for a while owned the second biggest games retailer in the UK. They went bust earlier in the year but some remnants of the chain are still around it seems. Looking on the website, they have one branch in my city, Glasgow, and two more in commuter towns well outside the city. (Glasgow isn't an enormous city, but is the biggest city in Scotland, and its greater conurbation has around 1.75m people).
Which makes it kind of weird that the pre-orders were 'record breaking', since they have so few shops left. Maybe on a per-shop ratio basis or something.
I'm not sure where else would be doing console pre-orders just now, mind you. Obviously Amazon et al will be doing them,* GAME obviously (our equivalent of Gamestop), the odd indie shop, probably HMV and maybe Tesco (our equivalent of Wal-Mart, though actually a rival to the Wal-Mart-owned-chain). Maybe all the mentals who want to pre-order a console and don't have the internet had to go to Blockies?
*I have noticed that Americans seem to buy games and consoles from Amazon and other internet retailers far less than we do in the UK. Presumably because your country is so vast, delivery takes a lot longer so you don't get them on release day?
And here, you can preorder you Xbone now with UK Blockbuster :D http://www.blockbuster.co.uk/buy/xbox-one/new-xbox.aspx