William Gregson had an interest in 50 slaving voyages between 1747 and 1780 .
The members of the syndicate were Edward Wilson , George Case , James Aspinall and William , James and John Gregson .
William   had an interest in 50 slaving voyages between 1747 and 1780 .
The members of the syndicate were Edward Wilson , George Case , James Aspinall and William , James and John Gregson .