I have had the same thing happen to me. engine would cut out when at idle, could re start it would idle for about 15-20 sec then cut out, or some tomes not start at all.
Located problem to be reverse light switch on gearbox , the terminals are supposed to be isolated from outer casing of switch, however I checked mine with multimeter and found meg homes on one terminal to body of switch, other terminal in k ohms to body of switch.
Found the circuit F1 10A under the bonnet, that feeds reverse light switch also effects other things such as Vehicle speed sensor, and Water in diesel sensor .
Proved it was the fault by un plugging connector to switch, car started fine and idled without cutting out.
The reverse light switch is in a position that can hold liquid around body of switch,and it appears in my case the liguid had slowly got into switch body and caused errors to be fed to computer. New switch has been siliconed around plastic part of switch where it meets the brass switch body to stop any future problem.
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