Hi pond50 - a reply from the BBC today, but no luck I'm afraid. Below an abridged copy of their email + bits added by me -
"I wish I could help you with this but the only information I could find was here: (same info given by Mamya & Buenchico at the start of the thread)...
I hope that by listening to them all you will find the right one. I have tried everything to find out which one. I even went back to look at the Charts around that time but I had no luck. I'm sorry.
I hope you get it.
Wish your friend all the love in the world from me. (I'd mentioned it was for your mother's funeral)
Kind regards,
(name removed as I don't know if I'm permitted to pass it on)
BBC Enquiries Team"
I'd hoped they'd be able to view the programme from their archives, but perhaps not. I'll pursue that avenue if you ask me to but I have the feeling that we've come to the end of this line of enquiry. I'm sorry I couldn't come back with better news.
I hope you're ok & look forward to seeing you around the site. :-) x