Four members of the London Assembly are the latest City Hall politicians hoping for promotion to Parliament in the general election.
The Assembly, set up to scrutinise the work of the mayor, has proved a successful springboard for wannabe MPs since it was established in 2000.
Eleven former Assembly members are recent or ex-MPs, including James Cleverly, Lynne Featherstone, Meg Hillier, David Lammy and Kit Malthouse.
Current Conservative group leader Gareth Bacon has been selected to replace Jo Johnson as his party's candidate in Orpington.
Labour's Florence Eshalomi is hoping to succeed veteran Vauxhall MP Kate Hoey.
Green Assembly member Caroline Russell is fighting the Islington North seat held by Labour leader Jeremy Corbyn since 1983.
David Kurten, who sits as a Brexit Alliance member, is the UKIP candidate in Bognor Regis.
Other former Assembly members sit in the House of Lords including Baroness Jenny Jones (Green), Baroness Sally Hamwee (Liberal Democrat) and Lord Toby Harris (Labour).
But the most high-profile City Hall graduate to make the leap from municipal to national politics is former mayor Boris Johnson, now Prime Minister.