Isn't the first question to ask....is it his van? If it isn't then he has to be bound by the rules of the owner. I think this is a van very local to me, belonging to Wakefield Distric Housing, an arms length local authority company. I was surprised when during the last world cup that we had an edict coming out allowing a small flag in the van, though it must be removed on the day of the final. There are plenty of companies/authorities who are particular not to portray an individuals choices as those of the parent company.
don't they know football is a religion and nationalism in football is too.. did they object to the display of polish flags or french flags or the like?
GOD BLESS!
Peace and Love,