The B323 is a short B-road in Westminster. The road was originally classified but, going by its number, gained Class II status in the late 1920s.
The road starts at a roundabout at the western end of the A3203 Lambeth Bridge, where it meets the A3212 Millbank. It heads west between two austere Government buildings into Horseferry Road. There's a brief respite as we pass St John's Gardens on the left but otherwise the road is lined with tall buildings, a mixture of shops, offices and flats.
After crossing the B326 Marsham Street at traffic lights the road bears round to the right to pass the HQ of Channel 4 and reach a mini-roundabout. We turn left here into Greycoat Place and pass the Grey Coat Hospital (a girls' school). Another mini-roundabout is then reached. Left is the B324 Rochester Row whilst the B323 bears right, still in Greycoat Place, then bears right again into Artillery Row.
At the far end of the short road we cross the A302 at traffic lights into Buckingham Gate, pass a couple of high-rise office blocks and the former Blewcoat School, which looks rather forlorn in its current surroundings. After a few bends we pass the back of the Wellington Barracks and arrive at another set of lights adjacent to Buckingham Palace where the B323 ends. Left is the A3214, which also ends here, whilst the road ahead leads past the front of the Palace and onto The Mall