Mary Berry will start the 2017 sheep drive across London Bridge.
Small flocks cross the bridge in both directions at 7 minute intervals.
Souvenirs including a sheep key ring will be on sale at the wool fair.
Officers of the Guildable Manor will welcome the City Liverymen and Freemen to Southwark.
For the latest local news and events direct to your inbox every Monday, you need our weekly email newsletter SE1 Direct.