By Frances Allitt
Dealer John Robertson vividly remembers the moment he uncovered the trove of pictures he is offering at this month’s Petworth Park Antiques and Fine Art Fair.
It was 1987 and he was visiting British artist John Heseltine (1923- 2016) to select some paintings for an upcoming show. As he prepared to leave, Robertson enquired about a ramshackle shed in the artist’s garden.