I agree, not the point though.
Again, who gives a shit about total numbers? They are meaningless, literally meaningless. If you can't cope with an immigrant population as a percentage of your whole population way lower than other countries who are doing fine, it obviously can't be a problem with immigration because they didn't come at once.
In a given time... i mean that should be obvious. Would you seriously consider it mass immigration if 8.5 million people moved to the UK over a period of 1000 years?