Belfast, UK. 13th March, 2015. Firemen below a Fire Service Union blimp at the Trade Union Rally in Belfast Credit: Bonzo/Alamy Live News

- Image ID: EHFR9P

Belfast, UK. 13th March, 2015. Firemen below a Fire Service Union blimp at the Trade Union Rally in Belfast Credit: Bonzo/Alamy Live News

Sean Harkin / Alamy Stock Photo

Image ID: EHFR9P