Negotiators are continuing to appeal to a man who is several metres up the clock tower of Big Ben to come down as darkness falls.The man, who scaled the tower at around 7.20am on Saturday and is holding a Palestine flag from a ledge, has been spoken to by emergency crews and negotiators several times but at 6.45pm had not yet agreed to come down.In a video posted on Instagram, he tells negotiators he will come down "on his own terms".

Negotiators are continuing to appeal to a man who is several metres up the clock tower of Big Ben to come down as darkness falls.The man, who scaled the tower at around 7.20am on Saturday and is holding a Palestine flag from a ledge, has been spoken to by emergency crews and negotiators several times but at 6.45pm had not yet agreed to come down.In a video posted on Instagram, he tells negotiators he will come down "on his own terms".