Have an ongoing argument with a mate at work who states that Celtic Park has the biggest playing surface in Scotland. I say that most pitches are roughly the same size 115/75 yards. Have noticed on Motherwell website that they say Ibrox has a far bigger pitch than anyone else, 125/89. Anyone have definitive info on this.

I'm not sure how definitive it is but this website seems to have all the pitch sizes in Scotland.

Scottish Ground Guide

http://www.scotprem.com/content/default.asp?page=s43

Pitches at Aberdeen, Celtic, Falkirk, Hamilton, Hibs, Inverness, Kilmarnock, Rangers and St Mirren are all 105m long. Pitch at Inverness is 69m wide (lots of others at 68m tbf...). Inverness' pitch is largest.