Help with W.W.1 British? cavalry lance

[Andy Stevens]

Hi to all and a Happy New Year,
Had this lance a while now, and have just decided to try and find out something about its history. I know its a little off the normal forum thing, but it certainly is a wonderful weapon, has a certain ammount of ethnographical cross over and if nothing else is just damn interesting
I'm hopeing somebody may be able to tell if the lance is in fact British or maybe Indian- was there a difference between the two armies weapons?
The stamp on the lance head reads to my eye as:
N2.1.1.P
CO1 - crow's foot with 5 below- C1915

The leather shoulder/wrist strap, is I think a replacement as is the white rope working.
Many thanks