Yeah not too much major Trouble between anyone and the Japanese at all.
Although im sure they get a bit of **** thats just comes with being an Immigrant in certain parts down here.
I doubt many people could even tell the difference between a Japanese and a Chinese person.
Apparently Melbourne and Sydney is becoiming more and more like spot the Aussie though because of the uni students
But anyway. Why not wack up an Immigration Scheme Similar to ours, scan the people who want in and if they are subtable stable(mentally) and safe then let them in. If not them deny them entry.
That way the people you get in will more then likely be helpfull to the ecconemy and not be trouble makers and help build the uk as a nation while you keep the bad ones out.
Im not sure what the laws on Asylym Seekers are though because they are different. Although still fairly tuff.