The vast majority is already controlled immigration which they could manage simply if they wanted to.
The boat people are very small numbers, it's just a diversion tactic.
Yes, realise that millions of extra people can't be coming in on dinghies. And it's not just us that's being swamped. Devastating for ordinary people, our culture, essential services, housing, quality of life, the environment, etc, etc none the less. No one voted for this - in fact the opposite. A once great country ruined by treacherous politicians for greed, money and power.