sinblack: In the London area 'trespassers on the line' is code for 'Signal Passed At Danger'. That is the driver made a mistake but they do not want to tell the public. Not sure if that is only on the Liverpool Street line or country wide.
Trains aside thanks all for attending. Also thanks to the muggle who caused confusion by being chatty and friendly before disappearing as he was not there for the event. It is nice to see new faces and have the opportunity to shout over the traffic noise.