Thank you for your very swift reply, Carole.
I did try asking his daughter Hattie, but she doesn't reply to eMails.
He died in Guildford. He was born in London, as was his father. I know of no family connection with Northern Ireland, so Lisburn seems an unlikely place to deposit the ashes -- and if so, then why in a cemetery with no labelled urn and without telling the council? It would seem more logical to scatter the ashes at some favourite beauty spot.