On the ride back from the Dun run a friend and I were approaching Waltham Abbey via country lanes. We'd just taken the decision to bail at the nearest train station because the general standard of driving had plummeted in response to a recent rain shower and we weren't feeling sharp enough to deal with it with any great confidence. We rounded a down hill bend to find smoke rising from the trees on the opposite side of the road and a wide swathe of the verge gouged away. A convertible BMW that must have passed us less than twenty seconds earlier was lying upturned in the ditch. The driver emerged as I got to the car and was able to tell me that there was one other person inside, just as she crawled out. One of the first drivers to arrive was on her mobile giving details to the ambulance service. The driver didn't appear to be injured but the passenger had a large number of minor cuts and lacerations and had lost her shoes (she was quite concerned by this). I tried to clear a path through the vegetation for them and tried to persuade them not to climb over the car, in which I failed. She slipped and then burnt herself on the exhaust. Other drivers helped the couple to the shelter of their cars and started to tend to them. It was at this point that I noticed that the woman calling for the ambulance was becoming more and more irate. It turned out that she lived at one of the nearest houses to the incident and had given her postcode but the operator was insisting that the postcode for the location of the actual incident was needed. The caller was getting angrier and angrier but continued to repeat what she knew - the postcode for what she thought to be the nearest property, the incident's location in relation to that postcode (road name, distance and direction) and the fact that there was no postcode for the exact location of the incident. This stalemate obviously continued for a couple of minutes until the point my friend and I, unable to offer any useful contribution, decided to set off towards 'civilisation' and flag down any emergency services that crossed our path.