Tony
What fields are you using already? One possibility would be to give details of
the type of association code played: London, Sheffield, Scottish or other (which
will usually be a local code). That will provide a better picture of the extent
of the Sheffield code and whether it was more popular than the London code. I
have details of games under Sheffield rules stretching from Birmingham in the
south to Middlesbrough in the north and across to Grimsby (but not on the other
side of the Pennines).
Ian Nannestad