London, UK, 17th Mar 2019. St Patrick's Day Parade photocall with Mayor of London Sadiq Khan (r) and this year's  Grand Marshal, actor James Nesbitt (l). London celebrates with a spectacular St Patrick's Day parade, led by this year's Grand Marshal, actor James Nesbitt. Now in its 17th year, the parade attracts more than 50,000 people for a colourful procession of Irish marching bands from the UK, US and Ireland, energetic dance troupes and spectacular pageantry. Credit: Imageplotter/Alamy Live News - Stock Image