Is that perhaps just the case in Scotland?
I’ve not seen the physical CL55 for England and Wales, but I can’t see any wording to that effect on the CL55 website:
www.gov.uk
There is Condition 10, which states that “You must comply with the Deer Initiative Partnership guidance on night shooting, in force at the time of action, and any other relevant best practices guidelines relating to the shooting of deer. If there is conflict between a licence condition and the guidelines, follow the licence condition.”
The Best Practice Guidance for night shooting, which is linked to from the above, goes on to say on Page 4 in the section on ‘Visibility & Shot’ that:
View attachment 465912
Which reads that heart/lung shot placement is preferred, but there may be good reason to use others where conditions make this necessary. If challenged, it would then be for the shooter to justify why any such alternatives were used.