I have no idea, maybe they had been told that a vehicle they were interested in was heading that way, a white Transot is fairly common. It was slightly alarming. It’s the only time I’ve ever had a gun pointed in my general direction. It would have been better had they been identifyable as police without relying on me spotting the van or speaking to them once I’d stopped.
Their van was tucked into this gateway https://www.google.co.uk/maps/@52.9200864,-0.4755723,3a,75y,260.77h,89.08t/data=!3m7!1e1!3m5!1ssi1BzBTt4OEEM875idWtiQ!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fcb_client%3Dmaps_sv.tactile%26w%3D900%26h%3D600%26pitch%3D0.9153548737870949%26panoid%3Dsi1BzBTt4OEEM875idWtiQ%26yaw%3D260.77472095004924!7i16384!8i8192?coh=205410&entry=ttu&g_ep=EgoyMDI0MTAyOS4wIKXMDSoASAFQAw%3D%3D I don’t recall seeing it until the last minute so maybe the gate was open or something and it was parked further in, it was a marked van so obvious once I’d seen it although no lights on.
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Anyway, we’re drifting a little off topic, I mentioned it as someone had said that the typlical STW demographic probably won’t ever be shot by a British policeman, this is entirely correct, but sometimes weird things happend when you really don’t expect them.