This is to say I am very grateful for all the advice and useful links sent. I've looked at it all. Will I die of old age before I finish typing all the extra text necessary? Also (I am speaking as a UK cataloguer), I find it noteworthy that all the help I have been given comes from the US and Canada, What about the other contributing countries?
ps 264 - I understand that OCLC allows it, but it's not in their bib format. Would it be right that I use 260 by default? Cheers Paul Davey