As for someones daughter finding a SAS lay up?
It's not really that surprising that she found an empty hide. Every now and again a blind squirrel finds a nut, (not meaning to be offensive to the lady in question). Anyone who has a reasonable level of fieldcraft/country living experience will notice signs that even the best can't cover up. OTOH, city boys would blunder right through and see nothing. There's nothing magical about "Them"... They are just well trained, properly motivated troops. But even they can't fix crushed grass and the other sign that are inevitable when you occupy an area.