What's this marking?

[22SqnRAE]

I've come across a bit of an anomaly in the family of Lee Enfield.

I'm hoping some eagle-eyed type with a heap more knowledge of matters Lee Enfield will be on the ball and put me in a place of higher knowledge. Or, start a damn good Anorak-like argument about what it 'should' and 'shouldn't' be! (Just kidding, let's not get too carried away here, this is a place to learn...)

Attached is the photo on the receiver ring of a No 4 Mk 1*.

What are your thoughts as to the origin and correct description of the marking?

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