It’s a farcical charade. Pointless window dressing to try to convince people that the government is ‘cracking down’ when they have absolutely no intention of doing anything of the sort.
Allowing uncontrolled mass immigration is actual U.K. government policy. It doesn’t matter which party is in power, or what the politicians say publicly, the policy doesn’t change. And the reason for that is that the U.K. economy has been addicted to unlimited cheap migrant labour for the past 25 years.
More than 9 million people between the ages of 16 & 64 are economically inactive in the UK (source : U.K labour market statistics), costing the taxpayer £billions every week in benefits.
That leaves vast gaps to be filled in sectors such as hospitality, care, retail, distribution etc doing the sort of mundane unskilled work which British people reject in favour of easier lives on generous benefits. Those gaps are filled by migrants and the functioning of the economy depends on them. Ending mass immigration would cause a serious recession, shortages in shops and nobody to staff care homes. Politicians know this, and they know that admitting it would lead to riots and probably insurrection. So the farcical charade continues.