I'm sure that's best practice, and not law. Well unless he's in Scotland
11 Prohibition of certain methods of killing or taking wild animals.E+W
(1)Subject to the provisions of this Part, if any person—
(a)sets in position any self-locking snare which is of such a nature and so placed as to be calculated to cause bodily injury to any wild animal coming into contact therewith;
(uses for the purpose of killing or taking any wild animal any self-locking snare, whether or not of such a nature or so placed as aforesaid, any bow or cross-bow or any explosive other than ammunitio