I live two blocks from Union Square and he was a fixture at the farmers market for so many years. I hadn't realized how much I missed him till I saw this.
As a fellow Brit, I'd say his accent is not particularly regional and definitely not upper class. As someone else said, class in the UK is so frikkin complex. Having grown up north of Manchester I wouldn't have placed his accent there - it's generically "northern" english with some touches of US in it.
A lovely, charming man - he took so much pride in his honest work.