Thanks Carole, I've re-read my post and I did say it was his wife who'd died in 2018 ... ?
His name is Alfred Glenton Preston (known as Glenton or just Glen), b. 10 Feb 1922 in Newcastle-upon-Tyne. He married a New Zealander, Bette, who, as I mentioned in my post, died in 2018. Glenton was a civil engineer, specialising in bridges, awarded the M.B.E. in 1984. They used to live at Clifton Gardens.