How did I ressurect a 9 yr old thread? - I just followed the link that you gave me Lyndell - I didn't notice its age (or the fact this may be seen as bad form!!). Also, I DID start a new thread, but haven't had a solution posted - until I ressurected the 9 yr old thread! So, moving swiftly on!
Ernie - thankyou very much for your offer. I'm afraid I have no experience of code entry, and so your procedure will have to include the basics (sorry). The models of remote I'm working with are - Marantz RC5000i and RC9200