TFL have announced that they will be closing the Kensington (Olympia) branch of the District Line to run an extra 5 trains
a day (not an hour) on the Wimbledon branch. This is annoying if you are coming from LGW and want step free access to the District line as this is the only practical way of doing this, changing at East Croyden.
If you are attending an exhibition you can expect a long walk from Earls Court (there is no direct bus) or from any of the other stations.
There is more including a petition (please feel free to sign) at
http://myolympia.org.uk/