The A4207 is a short road in west London. It is the highest-numbered A4xxx road in the original 1922 Road Lists.
The route starts at traffic lights on Westbourne Grove, half of which is the A4206 (that road zigzags here where roads diverge in five directions). It heads north along the residential Chepstow Road and reaches a mini-roundabout at the far end. The road heads west, with a Georgian terrace to the left and the 20th-century Brunel Estate flats to the right.
Just after the ultra-modern Bayswater Children's Centre, the road TOTSOs right, with the B412 continuing ahead. We continue along Great Western Road (which is lined with 20th-century housing) to pass Westbourne Park tube station, where we cross the Hammersmith and City Line and the Great Western Main Line before going under the A40 Westway. The road then crosses the Grand Union Canal and continues past older buildings to end at traffic lights on the A404 Harrow Road. Theoretically the B414 continues opposite but its route is pedestrianised immediately after the junction.