Apart from when they are used by Australian troops.
(I am presuming that the O'Hare troop mentioned here are Australians)
Warren Force - Papua
Or at Buna:
Kokoda
mentioned in this site on RA methods (Assuming 'RAA' is the Australian Arty? - and RNZA is the Kiwis)
3.7 Howitzer
the main site here looks interesting for British Arty in general
British Artillery in WW2
Cheers
Andy