Markings on a Lee Enfield Jungle Carbine

[GunsNotPuns]

Good day: A friend recently came into possession of a LE Jungle Carbine and there were some markings on the butt stock that I was hoping some of you experts could help us determine what they meant:

26 10 48
I H L
255
C. SQN

The first line is fairly self-evident as a date, the rest are open to a bit of interpretation. Any idea what lines 2-4 are?

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