Like Frank, I knew and dealt with Michael Parkington for many years. He had a large collection of Monart (bigger than any of his other collections by far), but he looked for quality of workmanship in each item. That is to say he wanted the best example of Monart, whether common or rare - meaning that rarity could well be turned down!!!
As for his 'depth of pocket', I often represted him at auction when he had to work out where on earth to get the money should he be successful. He was a true collector putting the need for the item before the 'incidental' of money - it was partly this that helped him build a collection that included so many top end items. Of course he also had a 'very good eye', something that is impotant to both collector's and dealers
Unfortuately, much of the monart collection was not photographed in the Christies catalogues - particularly in part one.