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World champion boxer Barry McGuigan said he was absolutely honoured to lead the St Patrick's Day parade as this year's Grand Marshall.
He said Ireland and England have enjoyed a great and brightening relationship over the last 15 years and that London was the "capital of the world".
A number of free events are taking place across London today as part of the St Patrick's Day festival.
- Boxing legend Barry McGuigan will lead the parade of Irish marching bands from Green Park to Piccadilly and Whitehall from noon.
- Trafalgar Square will go green, and host a festival of contemporary Irish music, dance and performance.
- Smash hit West End musical The Committments will perform at Trafalgar Square
- Lord of the Dance will perform their show 'Dangerous Games'
- A free film festival will take place at the Prince Charles Cinema at Leicester Square on Sunday from midday
- An Irish food market will feature at Trafalgar Square
Mayor of London Boris Johnson said he was asked to cut funding for this year's St Patrick's Day, but he refused.
The parade will be headed by former world champion boxer Barry McGuigan, will feature float representing all 32 counties of Ireland and will begin at noon from Green Park station.
It will travel along Piccadilly, Lower Regent Street, the Mall and Cockspur Street before heading up to Trafalgar Square.
Nelson's Column was illuminated green last night and will be for the next few days to celebrate St Patrick's Day.
ExCel London is hosting an American-style comic convention this weekend.
Organisers say it will feature the UK's largest ever selection of US comic creators.
The Duchess of Cambridge shared a joke with Downton Abbey's Carson during her visit to the show's set today, asking him if his suit and bow tie were "usual attire".
Carson, played by Jim Carter, responded "this is my relaxing gear", as he showed Kate the costumes trailer for the series.
The Duchess of Cambridge has been given the full tour of the Downton Abbey set today, with the manor's staff baking her a cake and even offering to polish her shoes.
The Duchess of Cambridge was presented with a cake by Downton Abbey cooks Mrs Patmore and Daisy on her visit to the show's studios today, but the stars admitted they didn't bake it themselves.
"Are you both fantastic cooks?" the Duchess asked actors Lesley Nicol and Sophie McShera on receiving the chocolate cake.
"You wouldn't want it if it was cooked by us," joked Nicol.
The Duchess of Cambridge watched filming of a new episode of Downton Abbey as she visited Ealing Studios today.
To mark her visit, the team behind the show left a small tribute on her headphones, by way of a label marked 'HRH'.