K Hayward and D C Richards are his linesmen, with J Farries overseeing the fourth official role.
James Beattie's second-half header in the 0:1 win over Plymouth Argyle in season 2007/2008 was the last Blades match Hall officiated. Incidentally, this victory was Kevin Blackwell's first as Blades boss.
The image used on this article is copyright to SportBox.TV