Boris Johnson prepares to serve food at the Royal Welsh Showground PA General election: On the campaign trail Jeremy Corbyn tries his hand at bricklaying during a visit to the West Nottinghamshire College Construction Centre, in Ashfield PA General election: On the campaign trail Liberal Democrat leader Jo Swinson during a visit to the London design museum to discuss the party's tech policy PA General election: On the campaign trail Brexit Party leader Nigel Farage visits Seaham Getty General election: On the campaign trail Britain's Prime Minister Boris Johnson arrives for the Conservative party's manifesto launch in Telford Reuters General election: On the campaign trail Labour Party leader Jeremy Corbyn meets supporters during a visit to Thurrock in Essex PA General election: On the campaign trail Protesters waitfor the arrival of Prime Minister Boris Johnson ahead of the launch of his party's manifesto PA General election: On the campaign trail Jo Swinson gestures from atop a crane during a visit to an eco home building site in Sheffield AFP via Getty General election: On the campaign trail Jeremy Corbyn meets a supporter on a train on his return from a visit to Sheffield PA General election: On the campaign trail Prime Minister Boris Johnson during a visit to Bassetlaw District General Hospital in Worksop, Nottinghamshire PA General election: On the campaign trail Nigel Farage campaigns in Hartlepool Getty Images General election: On the campaign trail Jeremy Corbyn outside an Amazon depot in Sheffield, to announce plans for a workers' rights revolution and to ensure big