Thanks for the replies ,just to update on this, before it left the garage last week I replaced the imv as my friends in ford said that after the injectors .that was the only thing that gave trouble.I had not scoped the sensors previous to the fitting as i haven't too much experience with scoping.I now see this was a mistake on my behalf and want to make sure now that nothing else is fitted without justification.
To answer your questions .unfortunatly I don't have a closed rail pressure kit (will have to inquire about one -any recomendations).The first 2 scope captures are when it lost power .Since the imv has been fitted it doesn't seem to lose power completely as much ,but still untrustworthy as its a taxi.
I think I will have to inquire about some diesel diagnostic courses ,or some of F Masseys dvd,s.
Will try and get better scopes tomorrow as customer wants it back for some special school run.