john hartson was once on the end of a major hampden injustice while playing for celtic - but he can not see any point in his old club writing to the scottish football association over the latest controversy at the national stadium .
hartson had a goal wrongly disallowed for offside while celtic were 2-1 down in an old firm league cup final and the welshman went on to miss a last-minute penalty that could have sparked extra-time .