DS Head and DC Wombwell exited the car and walked over to the van, where they questioned Witney about the lack of a tax disc. He replied that he had not yet obtained his MOT test certificate, which was required before a tax disc could be issued. DS Head asked Witney for his driving licence and vehicle insurance certificate; noticing that the latter had expired at midday, he told DC Wombwell to write down Witney's details and walked around to the other side of the van. Witney protested that he had been caught for the same offence two weeks before and pleaded to be given a break. However, as he did so his front seat passenger, Harry Roberts, produced a Luger pistol and shot DC Wombwell through the left eye, killing him instantly. DS Head ran back towards his car but Roberts chased and, after missing with the next shot, shot him in the head. John Duddy, the back seat passenger, also got out, grabbing a .38 Webley Service Revolver from the bag next to him (which also contained a third gun). He ran over to the Q-car and shot PC Fox three times through the window as he tried to reverse towards him and Roberts, who also fired several shots. As he died, Fox's foot jerked down on the accelerator pedal causing the car to lurch forward over the prone body of DS Head, who was already dying of his wounds.