Business Correspondent Glen Goodman reports from Finsbury Square, in the City of London.
More top news
PC Keith Palmer will be remembered permanently at the National Memorial Arboretum, Home Secretary Amber Rudd has said.
ITV News rounds up the best pictures of the day as campaigners make a final stand before Theresa May triggers Brexit on Wednesday.
Demonstrators are gathering to march through central London towards Parliament Square, the scene of Wednesday's terror attack.