**Competition time**Spot the difference between these 4 challenges to win a slot as a grade 1 referee and a Celtic Park season ticket. pic.twitter.com/7TvUNslzI4— Seville Calculator (@SevilleCalculat) September 12, 2020
**Competition time**Spot the difference between these 4 challenges to win a slot as a grade 1 referee and a Celtic Park season ticket. pic.twitter.com/7TvUNslzI4