Yes, I remember Vince Miller on the pitch and singing. More recently, he was working in the lounges at the rags but lost that gig over four years ago. They claimed it was a general reshuffle to change the matchday corporate offer, but he'd been subject to a complaint for putting his arm round a waitress and calling her 'love'. There's a link here if anyone can stomach visiting the Mail's website:
https://www.dailymail.co.uk/news/article-4351746/Loyal-Manchester-United-steward-forced-hostess.html
The article said he'd been at Old Trafford for 29 years before being relieved of his duties there. However, there must have been a time when he did matchday work at both clubs as I remember him on the pitch at Maine Road in 1996 before we played the game against Liverpool that sent us down. IIRC, he was in a white suit and sang 'Abide With Me'.