Logo for the annual sheep drive across London Bridge. Held annuall for fundraising and publicity for many good causes. All Freemen of the City of London have held the right to drive sheep across London Bridge since time immemorial. Although this lapsed into distant memory the concept was revived in modern times to publicise London, London charities and sheep charities and organisations – in particular Shepherd Publishing and the National Sheep Association. Usually the first Sunday in October.