Why no riots in Scotland or Wales?

[Bear]

Wales,more so Cardiff has been ethnically diverse since the industrial revolution.When Cardiff was the busiest port in the World because of coal,it was Arabs,Africans and Orientals who worked on the docks.
If you look at British history,it was Africans,Muslims and Orientals who worked in the engine rooms and as stokers in the merchant and battle ships during our wars,but they very rarely get a mention!