The pool has an infinity-edge practically right up to the window view of the 52nd floor. A photo of the view is up at the Telegraph Travel page (see link below).
The writer from the Telegraph described the view described the view as follows:
"... OMG. The views. To the left, the pods of the London Eye; panning right, Big Ben and the Houses of Parliament, followed by St Paul’s Cathedral and the Tower of London. In between there were monuments testifying to more recent works of architectural genius: the Gherkin and the Cheesegrater – and yet further (round the huge bend in the Thames), the ever-winking light on top of a Canary Wharf tower still smarting at being eclipsed by the Shard as London’s tallest building. ..."