WOW
You wait weeks for a reply & then forget about it & then WHAM - you all enlighten me.
Thanks everyone
Of course I wasn't sitting around on my hands & have since boned up on IEC 60950-1 in comparison with IEC 60601-1 & got my head around MOPPs & MOOPs - all information is grist to the mill but then too much information delays the decision making so hence satisfycing - you could say muddling through with the information to hand that you can digest in the time available.
I realise there is an international audience for the EBME Forum & apart from the miles we are separated by our own understanding of the English language.
Thanks again everyone