Actor and documentary maker Ross Kemp and Call the Midwife's Helen George join Matt Baker and Alex Jones on the One Show. Justin Rowlatt finds out why knocking on doors is still so important for winning votes while Gyles Brandreth and chef Ricky Andalcio try their hand at door knocking in Grays, Essex during the show. Alex Riley looks at the costs of child care, and John Sergeant visits a town that has been built to be taken apart, so that huge oil drilling equipment can be carried through the small streets. Muriel Gray walks around the newly restored Glasgow Art School.