"A person aged 18 or over (A) commits an offence if— (a) he intentionally engages in an activity (b) the activity is sexual (c) for the purpose of obtaining sexual gratification, he engages in it— (i) when another person (B) is present or is in a place from which A can be observed, and (ii) knowing or believing that B is aware, or intending that B should be aware, that he is engaging in it, and (d) either— (i) B is under 16 and A does not reasonably believe that B is 16 or over, or (ii) B is under 13."
"… the offence is committed if the person (A): i. intentionally engages in an activity that is sexual; ii. in the presence or under the observation of a child (B); iii. A does so for the purpose of A's obtaining (some) sexual gratification from B's presence or observation; iv. A knew or believed that B was aware of the activity or intended that B should be aware of the activity; and v. the child B was under 16 and A did not reasonably believe B was 16 or over or B was under 13."
"The real question in this case was whether the defendant gained sexual gratification because it was in the presence of the child. In my judgment a jury properly directed could not be sure the defendant while masturbating derived sexual gratification from the presence of his child, and in those circumstances, I would direct the jury to find the defendant not guilty ... "