Thanks Mintyman for the PDF, though as previously discussed in this thread, none of us will have the gall to post our entries as solution has been provided by Doc in error...
I feel such a fool. My printer is not working at the moment so a friend of mine printed this off for me without the solution etc from 3 weeks ago. Did it, posted it and then thought I'd look at what others had to say! Oh well, it's merely a wasted second class stamp but, at least, I got though it and learned something new.