The B319 is a side road in Westminster. The road was originally unclassified; as its number is the first available B3xx in central London it presumably dates to the mid-1920s, although this is not certain.
The road starts at the southern corner of the B310 Belgrave Square and heads west along Pont Street, through the embassy district. We cross Cadogan Place Gardens and then the A3216 Sloane Street at traffic lights. At the striking St Columba's Church, which has been visible for some time, we bear right into Beauchamp Place, which is narrower and lined with expensive shops. It's not long before the road ends at traffic lights on the A4 Brompton Road. We are required to turn left but all movements from the A4 are allowed.