Stanley Gibbons issued a stock exchange announcement this morning to update investors that the "funding arrangements" for Law's company Millicent for the payment of the initial £2.25m that was due on completion of the deal is "delayed as a result of a change in the financial backers of Millicent".
When the deal had been announced in May, Law was working with investor Gavin Alexander.
Stanley Gibbons said it is working with Millicent towards completion of the sale before July 31 and said it will update on the matter in due course.
Law's company had agreed to buy Dreweatts and the brand name of furniture dealer Mallett.
ATG is awaiting comment from Law as this article was published.
Stanley Gibbons itself is also up for sale