They are Boys rifles but those are scout carriers not MK1's.
Scouts and Brens were commonly used together as part of the BEF they had a few early MK1's.
It seems common in the BEF for each carrier to have a Boys and a Bren but I have a official pamphlet from a little later in 1940 that says one Boys rifle to every three carriers, each carrier having a Bren.
Ben
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