Craigyboy, it is a little bit against the law mate, it's all about context though and how the other person felt when it was done etc,
Threats to kill.
A person who without lawful excuse makes to another a threat, intending that that other would fear it would be carried out, to kill that other or a third person shall be guilty of an offence and liable on conviction on indictment to imprisonment for a term not exceeding ten years.
As the bloke in the 4x4 has witnesses, you'd hope they'd all be grown up about it.
Mr Coc-Pops, you might be best going and finding the bloke in the 4x4