No statute defines indecency, yet this is the element that makes the difference between common assault (a summary offence, maximum six months) and indecent assault (maximum now ten years). In gross cases no question arises; the trouble is with the marginals. The courts solve them, as they solve so many problems on jury trial, by leaving the question of indecency pretty well at large to the jury. This long-established rule was reaffirmed by the lords in Court. Lord Ackner, with the concurrence on this point of all the other lords, said ‘The prosecution must prove & that the assault, or the assault and the circumstances accompanying it, are capable of being considered by right-minded persons as indecent’.