diginagain,
The orange and black Bells are the ones out of Wallop whilst the yellow and black ones are from the driver training school at Shawbury. The Wallop ones are the ones that came back from Brunei a while back, and listening to them go over on a daily basis is like being in your very own Vietnam movie and frankly sounds louder than a Chinook.
Always a pleasure to hear them, for some reason I start humming Paint it Black or This is the End, much to the confusion of the CS who sits next to me.
Anyway, back to the OP - no idea what they were doing together. Maybe the Merlin, which I always thought to be quite a pretty aircraft, was after a bit of rough
