That isn't necesary this gun is in british OOB in weapon slot. You moust see weapon 015 this is 37mm bofors. Today is used only by unit 252 LRDG Chevy ATG (gun on truck).
I think this units need a new picture for example this
http://odkrywca.pl/forum_pics/picsforum9/v_bofors1.jpg
http://odkrywca.pl/forum_pics/picsforum9/v_bofors2.jpg
this presents Cheavy trucks used by LRDG with this AT gun
And secound truck in LRDG service Ford F30 30cwt
http://odkrywca.pl/forum_pics/picsforum5/37boforsqf.jpg
British Bofors in polish Carpathian lancers brigade as portee
http://odkrywca.pl/forum_pics/picsfo..._rgt_at_ar.jpg
and as infatery AT gun during fights in Tobruk too Carpathian lancers
http://odkrywca.pl/forum_pics/picsfo...ofors_copy.jpg
Bofors in Australian hands
http://odkrywca.pl/forum_pics/picsforum10/ump_copy1.jpg
http://odkrywca.pl/forum_pics/picsforum10/ump_copy2.jpg
And bofors in British service western desert as standalone gun
http://odkrywca.pl/forum_pics/picsfo...obritatgun.jpg
http://odkrywca.pl/forum_pics/picsfo...bof_copy13.jpg
as british portee
http://odkrywca.pl/forum_pics/picsforum16/bof_copy9.jpg
and during exercises in Britain homeland short before war propably summer 1939
http://odkrywca.pl/forum_pics/picsfo...bof_copy10.jpg
http://odkrywca.pl/forum_pics/picsfo...bof_copy14.jpg
I reead about use this gun in north africa , portee version too in greece. Was too used in Malta defense force