and it it really is covered by the passages in  erm   erm, just, i just reiterate that that that expressly referring your lordship to it,professional duty except in so far as it may be necessary to elucidate the rules   that that was at page eight hundred and forty one at the bottom  and it goes over the page to eight four two  and then proceeds to  general proposition to those two  experts ordinary witness may not  may not give their opinions towards matters legal or moral obligation.