Mark Wallinger unveiling one of his 270 pieces for each of the stations on London Underground network.
More top news
Sir Bernard Hogan-Howe is to retire after five years as the Commissioner of the Metropolitan Police, according to Scotland Yard.
The curtain will come down on the show for the final time at the Piccadilly Theatre in March next year, before embarking on a UK tour.
Choudary was jailed after encouraging backing for the terrorist group IS in a series of talks posted online.