So a little report from my foray to several central London bookshops:
Waterstones Victoria: Three copies under "new books" right at the front of the store and on eye level
Waterstones Trafalgar Square: Allegedly available within two hours from store, but I could not find it anywhere
Waterstones Covent Garden: One copy on a bottom shelf, only spine visible, placed right under "Queer Bible"
Foyles Charing Cross Road: One Copy upstairs in the Feminism section, nothing under "new" or "highlights"
Waterstones Piccadilly: Not downstairs with the "new" non-fiction books, went upstairs and could not find it on a shelf, asked a staff member and was shown a table where at least five copies were stacked up
Hatchards: Three copies in the "new non-fiction" section on the ground floor, but it looked like books had been bought as the shelf was not "full", if that makes sense. I bought one of the copies there.