"(1) A person is to be regarded as driving dangerously if and only if -- (a) the way he drives falls far below what would be expected of a competent and careful driver, and (b) it would be obvious to a competent and careful driver that driving in that way would be dangerous. .... (3) In subsection (1) above 'dangerous' refers to danger either of injury to any person or of serious damage to property; and in determining for the purposes of subsection (1) what would be expected of, or obvious to, a competent and careful driver in a particular case, regard shall be had not only to circumstances of which he (the notional competent and careful driver) could be expected to be aware but also to any circumstances shown to have been within the knowledge of the accused."
"What is required in any particular case where the judge fails to leave an alternative offence to the jury is that the court, before interfering with the verdict, must be satisfied that the jury may have convicted out of a reluctance to see the defendant get clean away with what on any view was disgraceful conduct."