After a decent 200 mile run to S Wales, went on short drive to supermarket. My engine suddenly went dead. Electrics aok, turned over OK but would not fire. Pushed it to side of road then tried to start again and off it went. Following day half an hour into trip, died again. Called out AA. After half hour tried again. Started OK - cancelled AA. Set off and ten minutes later died again. AA did diagnostic - reported low fuel pressure. Towed me to garage. Tried it at garage - started OK! AA guy suggested fuel pump (unlikely given intermittent nature of fault) or pressure switch or camshaft sensor. Any ideas folks? Thanks in anticipation!