They circled around about 3 times and then flew off to the south east. I'm not sure if there was any war-related even going on, but there are three old airfields in that direction: Culmhead, Smeatharpe, and Dunkeswell.
Edit2: Silly me, of course the operational RNAS Yeovilton is to the south-east, and its satellite/training ground is Merryfield airfield: to the east of Taunton. Still, it's unusual to see that many!
They were too far away to get good pics but I took a few...mostly sky but you can make out the helicopters
Edit: Ooo...they just came back, minus trucks