Well, there are lots of pics there if you Google, but some are pre-war , some post-war and they don't explain very much on their own.
First , British 8th Army :~
Replace the breeches with KD trousers, or shorts worn with hosetops, and short puttees .
The buttoned pullover is a distinctly Indian Army type, and although it was used by Indian Army troops in North Africa ( remember that the Desert Army was made up of British , Indian , Australian , South African and new Zealand Troops , each with some slight idiosyncracies of dress ) it would not be typical of other Commonwealth troops. They wore pullovers with the plain circular or V neck .
All troops wore Battledress in the winter, sometimes mixed with the Khaki Drill items.
The helmet , Thompson and the webbing are fine.Most men of course carried rifles, the SMG being reserved to Corporals .
For a Gurkha :~ A complex subject. Basically Gurkha Regiments were part of Indian Army Infantry Divisions, which were dressed very much like other British or Commonwealth troops apart from the traditional items of clothing. The exact uniform of course changed depending on climate and the period of the war. In the desert,dressed as I explained above.
In Burma, in 1941/2, effectively the same Khaki Drill outfit. After that they were dressed in Jungle Green , with green webbing and long trousers. Of course they need a kukhri, and often wore the felt slouch hat when not wearing the helmet.
It's best to read around the various campaigns a bit before jumping. But the figure as it stands could easily be converted into a Desert War figure by changing the legwear. KD outfits from DML are still sold as spares.
But I think he could more easily be a Gurkha, so why not in the desert? Then he just needs a kukhri and some KD trousers ( sort of cooler weather combination ), and you keep the pullover.
Maybe if you unroll the puttees those breeches are actually trousers ?
If you want more, you know where i am...