In 2012, users of Clapham Junction station may have noticed the mysterious renumbering of platforms. Curious, we asked for an official explanation and here’s what we were toldThe old platform 1 (disused) has now become platform ZERO but is not advertised as it will be never used. The old platform 2 in now platform 1, and there is a new platform 2 is being built for the new London Overground Rail Operators Ltd (LOROL) service which starts in December 2012
So now you know. Many thanks to John Walsh at SW Trains for providing us with the information.