chapter 13 page 77
gives you a list of calibres and what they are recommended for (which is out of date)
it clearly states that a .375 is not suitable for deer and any other large game
but on page 70 of the same chapter
13.35
it says this
13.35 Some rifles intended for
antelope and other Plains Game may also
be suitable for deer, boar or other quarry
shooting in this country. Calibres such as
the .375 (9.5mm) are at the lower end of
those suitable for shooting "dangerous game"
but may, once initial "good reason" has been
established, also be used for shooting the
larger deer species in Britain. Expanding
ammunition may also be authorised for an
applicant whose certificate allows for the rifle
also to be used for shooting deer in Britain.
2 different pages saying 2 different things about the same calibre
so on that with the calibre chart being the one that stands out as more as a definitive answer with the word NO in big letters
so if your chief of Firearms is against a .375 for use in this country, then you will need to find a piece of ground that has been passed with .375 for deer already to help fight your cause (there are some exceptions)
Boar is not a good enough reason as yet, thou some counties are recognising it as exceptable
untill .375 is actually written into the wild boar guidlines as a recommended calibre for use on boar, then you may find it will be a while before every department excepts it
but what you need to remember is the Firearms licensing departments are still using out of date guidelines to stipulate the law
ATB