These are Peter Pig's early WW1 British Vickers machine-gun teams.
(https://1.bp.blogspot.com/-PATqhzIDaPY/WAPcWV07B4I/AAAAAAAAHLk/dPY-FIzOEmIREuYr4C_bCwwqelnwUC66QCLcB/s1600/BritishWW1Vickers-001.jpg)
They're supplied three guns to the pack, but for some reason, Peter Pig only include observers/gun-captains for two of them. At first I assumed it was a packing error, but the same occurs with the German Maxims pack, so I suppose it's company policy for some reason that I can't fathom. It's not a big deal I suppose, but it's an irritation.
I think that the Vickers used by the British army in this period would have had fluted barrel jackets, not smooth, as these ones are modelled.
They're based on 30 x 30 mm 3 mm hardboard. I've come around to using thicker bases for these sorts of things because it makes the groups so much easier to pick up and move around the wargames table than the thin steel I used to use.
(https://1.bp.blogspot.com/-sWbCin5YYRk/WAPceT_GSPI/AAAAAAAAHLw/Grg8_IU9pkQn68OHKNhIzq459NC_Hc8_wCLcB/s1600/BritishWW1Vickers-002.jpg)
(https://2.bp.blogspot.com/-YnyGBjxvYyk/WAPceRTmp3I/AAAAAAAAHLs/xlCBnxNHDjQhhlJ_iy02JcZUJYcZlWP-wCLcB/s1600/BritishWW1Vickers-003.jpg)
(https://1.bp.blogspot.com/-02n3q6nxWbo/WAPceV2uyNI/AAAAAAAAHLo/cnjgAG2keAY8zu_leyCx7JXb8kbVe5zbwCLcB/s1600/BritishWW1Vickers-004.jpg)