Welsh racism

Should English fans be allowed to fly the Cross of St. George from their cars whilst in Wales?

The deputy chief constable of North Wales Police fears Welsh fans could be provoked into violence or racism by English fans flying the flag. Would he arrest the Welsh 'patriots' or the English fans who provoked them?

Would any senior English Police official advise 'foreign nationals' not to antagonise latent English racism by flying their own flags!?!