All of the main stations have loads of bikes, ignore the website. Distance??? Distance to what? Personally, i think they are a rip off, it's fine ( i guess ) for riding between stations, but can get expensive without the yearly pass & they are horrible to ride for long periods. A much better option is to hire a bromton, that way you just take the bike with you, rather than faf about every half hour docking & un docking.
Brompton's folding bikes are available for hire ? with new locations announced | Health News | Lifestyle | The Independent