At approximately 20:40hrs on Sunday, 10 February police responded to a report of an aggravated burglary at a residential address in Harrow.
As part of this response, a vehicle pursuit was initiated.
The police helicopter was also called to assist.
At approximately 21:00hrs the vehicle being pursued moved onto the wrong side of the carriageway on the A40. The police vehicles did not follow.
The vehicle was then in collision with a coach near the junction with Kingsdown Avenue, W3.