Their target seats are: Brighton Pavilion, where Keith Foster is their best hope of overturning Labour's 9,643 majority; Lewisham Deptford, where Mr Johnson, twice a London mayoral candidate, is standing against Labour's Joan Ruddock, who has a 15,293 majority; Bethnal Green and Bow, where journalist John Foster, 30, is tackling Labour's Oona King, with a 10,057 majority; and Norwich South, where Adrian Ramsey, 23, is taking on Home Secretary Charles Clarke with a majority of 8,816.