The bible on this is the book 'Great Britain - The Tommy Gun Story' by Tom Davis Junior. Neither Sten Mags or 30 round Thompson Mags would fit into British Mk 1 Bren Mags. With the 39 pattern leather equipment they modified the pouches by taking off the popper tab and moving it up.
The British Army had just adopted a metal box to hold 20 round mags when the americans decided to discontinue production so they were not very happy.
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