Police say the car - a red hatchback - was last seen driving north on Boston Manor Road toward the A4:
- Witnesses report seeing two white inside the car
- The car is described as being "dirty"
- Police say the vehicle would have damage to its front
More top news
A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.