Thanks for the reply Karen.
Yes, i wore the orthotics. I wore them to 2 practice sessions and they seemed to be stopping the pain. I played one 45 minute half of a game one week and was OK. I then played 90 mins the following week, half way through this 90 minute game the pain suddenly came back. I was just running in a straight line and didn't do anything to set it off.
The pain seems to come from the outside. It's very tender if i tap the inside ankle bone.
The shin bone directly above (on the left side) becomes tender too and even appears to show slight bruising. I sometimes get an ache in my knee too, but not while i play.
Hope this helps.