For the benefit of non-Londoners, this is the map of the central part of the Tube system in London - slightly extended down as far as Wimbledon for His Holiness' benefit ! - which makes it clear, I think, that the Circle line (the yellow, bottle-shaped line) is of great importance to the rapid and easy movement of large numbers of people around Central London . . . and, of course, it makes access to both sides of Hyde Park very easy (Kensington High Street and Notting Hill Gate) - particularly from most of the major mainline stations bringing people in London : very convenient for the many thousands who will be going there tomorrow . . . no ?
No : because the Circle line is, apparently, closed all this weekend.
Now that's what one calls really sensible forward planning !