Whether or not the claims in this article are true (and I'd like to see rather harder evidence than the casual recollections of a former speech-writer) it's disingenous to suppose that it's all the current government's fault. This has been a slow burn for fifty years. Over that period governments of both parties have, for various reasons, taken their eyes off the ball. Many recent immigrants are a direct consequence of the original large waves in the 1950s and 60s, through the import of spouses for second and third generations, or of extended family members. In the early period it was Conservative governments who saw immigration as a solution to labour shortages: while it was a Labour government (Callaghan's in the 1970s) which introduced the first serious immigration controls.
So you believe it began with cheap labor - and became a chance for Labour to harvest voters?
That’s the pattern for power mongers ala Democrats!