Last time I checked I couldnt find one, I even went down the route a detector, but as the gosafe vans use vertically polarised k band at low power (redflex) that makes the whole exercise a bit pointless. Just remember the range of the gosafe vans is incredibly limited, drop anchor if its safe to do so. I get the logic of having gosafe vans, and I'm not against them, but when you see them parked up on a motorway (M9 last week) its taking the piss.