If you read the article you will see that immigration from outside the EU is rising just as quickly! so leaving the EU will not solve it.
Again, ECHR (condition of EU membership) assures right to family life, so having accepted some, we have to accept their spouses etc. and cannot return others.
Leave EU, no longer bound by ECHR, control returned to UK Parliament – in the meantime we are bound to accept.
FWIW the wording was if you elect a conservative govt.
They didn’t, everyone knows that thry didn’t, there was a coalition.
in fact I recall you quite clearly pointing out at the time that the conservatives didn’t have a mandate – if they didn’t have a mandate, then clearly they didn’t have a mandate to restrict immigration, did they?