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Horrendous. The building is the one on the north-east corner of the junction of Great Western Road and Woodfield Road. It looks as if it's mainly the fence-topped low wall surrounding the house that was hit, not the building itself.
The Standard has more graphic details and witness statements, which suggest that the victims were the occupants of the car. Warning: Absolutely sickening to read, as the car turned into a death trap.
https://www.bbc.co.uk/news/uk-england-london-58555703
RIP