Ahhh Yes I see Tim! sorry a misunderstanding!  the spike is called a kaudi in Nepal. It normaly has religious significance & puts  cosmic power into the kukri.{for hindus & sometimes buddhists.} Although many  kukri kaudi have fairly simplified shapes. 
 
Plate 468 is a standard ww2 mk.II  kukri made by pioneer in Calcutta in 1943, it has steel bolsters /& buttplate & if you notice the spine is more rounded rather than angled or shoulderd like you specimein. Yours isnt a mk.2. 
 
Its always nice to find a provinaced item! Congratulations!  
 
As an officers it would be private purchase normaly although many would buy issue style kukris. 
 
 
I would  personaly would term yours  "Private Purchase British Officers ww2 kukri" Rather than a pattern type.  
 
 Was the fellow a Gurkha, Chindit, RAF or another branch? 
 
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