I would go slightly further (and slightly tangentially) and say that it should become normal practice during precautionary landings to actually land, (by agreement etc) in a suitable field.
We had an interesting dicsussion at the senior intsructors forum,at Cranwell last week about PPLs reluctance to perform precautionary landings. It was suggested that several weather related fatalities over the years might have been avoided if a precautionary landing had been carried out.
The problem is that for a PPL who will be as stressed as hell when he finds he cannot get back to his destination/base/divertion field will have an intense inertia to performing something he has never done before. His instinct will be to stick with the familiar and try at all costs to get back to a proper familiar airfield.
The only way tp overcome this inertia is for him to have previously actually landed in a field safely under controlled conditions. He is then much more likely to take the right decision in the stress of the situation.
The CAA should work with the FTOs tp try and facilitate this type of more realistic emergency training.