465. Common general knowledge.

Common general knowledge is the sort of knowledge which would in fact be known by the appropriately skilled addressee1. It is the mental equipment that is necessary for competency in the field of endeavour in question and in that sense is knowledge over and above the general knowledge which an ordinary member of the public would possess2. It is different from 'public' knowledge which includes matter which has been publicly disclosed but which may be unknown to the skilled addressee