Who else mentioned the shop allegedly burning down?
Possibly someone called Dennis Wager, as the following is in Carol Ann Lee's book:
Dennis Wager was also hired to construct a new shop at Osea Road after
the old one was destroyed by fire; it was the second case of suspected arson at the site. Jeremy was given the responsibility of planning the layout, advertising the lease, and estimating costs.
Wager disliked working with him: "He appeared full of his own importance. He was also always trying to impress upon people that he was one of the governors."This excerpt was attributed to:
Dennis Wager's w/s, 23 September 1985. But I don't know if she's attributing Dennis Wager for the whole story, or just the bit in quotes at the end.
Not sure if Dennis Wager's W/S is available anywhere. I haven't looked.
There isn't anything about Jeremy Bamber actually committing the arson.