The B263 is a largely urban road in southeast London. It starts at a junction with the A211 Footscray Road in New Eltham, from which it runs southward for just over three kilometres as Green Lane, crossing the A20 at traffic lights and reaching the A208 at the northern corner of Chislehurst Common. The itinerary thus far was added to the route in the 1930s; before that the B263 amounted only to the final 750-metre stretch which, after crossing the A208, we now follow, to meet the A222 at the south end of the common.
The Prince Imperial Memorial beside the B263 in Chislehurst
This last, very leafy, section is named Prince Imperial Road, after Napoléon Eugène Louis Jean Joseph Bonaparte, son of Emperor Napoléon III of France. The imperial family had fled to England following the Franco-Prussian War of 1870-71 and set up home in Chislehurst. In 1879, at the age of 23, Louis-Napoléon (as he was known) joined the British forces fighting in South Africa as a lieutenant in the Royal Artillery, and met his death in a Zulu ambush. A large Celtic cross standing on the east side of the B263 just before the road's southern terminus is a memorial to the prince.