When 4 CMBG was attached to 2nd Div BAOR we'd see Brit rubber tired recce vehicles with converted Brens on exercises around Sennelager. Easy to spot as they had straight mags as opposed to curved.
The squaddies I new reluctantly accepted the GPMG, sorely missing the Bren just as they did the Vickers MMG.
The funny thing about soldiers is the old kit is always the best kit. I remember wanting a rucksack with the sleeping bag on the bottom, then getting it and wanting the old rucksack back. You should hear all the complaining about the Tac Vest now. I say given em a P64 webbing set in training, they will not complain then.