D Day Veterans from Hillingdon are piped aboard HMS Belfast on the 68th anniversary of the Normandy Landings.
They are attending a special lunch on board the ship.
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Tree surgeon Ben Atkinson could be seen balancing on beams half way up the tower.
The flag was seen flying from the scaffolding around Big Ben.
Campaigners calling for a second referendum on Brexit are set to march through central London at midday.