> If the UK is so porous then how come Germany wasn't able to stroll over in 1940.

A few thousand unorganised migrant workers who are trying to smuggle themselves in with no more than a suitcase each and try to hide in the corners of soceity when they get there is quite different from a massive uniformed army with tanks and trucks who then try to take over the running of the government when they get here.

Also the army was legally allowed and ordered to shoot the Germans who were trying to come over, whereas they is not the political will to shoot migrant workers.