I can't find a reference to the issue in Manchester, though I can only read him in small doses. The transactions (Sutherland & possibly Brereton got smaller amounts) were uncovered by Carol Petillo during PhD research. Given that she published a Mac Biog in 1981 & Manchester published in 1978 it is very possible he was unaware of the information. It is, however, a little embarassing that he missed it & a lowly PhD candidate picked it up. Oops!