Roundtable
Why is anti-migrant activism on the rise in Britain?
23:49
Mass anti-migrant protests have been erupting in Britain with hundreds of masked men blocking England's busiest port Dover and in Portsmouth where a mega dinghy carrying 140 migrants landed.
Riot police clashed with the demonstrators as they tried to stop a bus carrying asylum seekers from leaving.
During the most recent protests in Portsmouth two men and a teenage boy were arrested.
The…