He began his professional career at Arsenal, but his first team involvement was limited to a single appearance on the substitute's bench in a 1–5 defeat at Aston Villa on 24 April 1979.

[4] The change was too late to save the Spireites from relegation in 1999–2000, but with some shrewd signings by Law, the team dominated Division Three in 2000–01 and led the table, until the pressures of the Football League enquiry into financial irregularities started to impact on performances.

The Mariners had recently dismissed Paul Groves and were struggling in the lower mid-table of the third-tier of English football following relegation from the First Division a few months earlier.

He turned his attention to the transfer market and acquired John Thorrington, Alan Fettis, Paul Warhurst and Mickaël Antoine-Curier amongst others.

However, in the final twelve games of the season Law only posted three victories, two draws and seven defeats which confined Grimsby to a second successive relegation.