Reform UK has unveiled a hardline migration policy that would see up to 600,000 people deported over five years if the party came to power.
Party leader Nigel Farage announced what he called Operation Restoring Justice, pledging to stop all asylum claims from those arriving on small boats.
The plan proposes detention at disused RAF bases before removal to countries of origin such as Afghanistan and Eritrea, or to third countries including Rwanda, Albania, and potentially British overseas territories like Ascension Island.
Reform says up to 24,000 people could be held in new removal centres within 18 months.
Migrants would be offered £2,500 to return voluntarily, but anyone deported would be banned from re-entering the UK for life.
To enforce removals, Reform would seek to pass a new Illegal Migration (Mass Deportation) Bill.
This would require the home secretary to remove illegal migrants, withdraw the UK from the European Convention on Human Rights, and disapply international treaties such as the Refugee Convention.
The party also wants to replace the Human Rights Act with a British Bill of Rights covering only citizens and legal residents.
Reform estimates the programme would cost £10bn over five years but argues it would save money currently spent on asylum hotels and support.
It promises to scale up charter flights to five deportations per day.
Labour dismissed the policy as unworkable and lacking detail, while the Conservatives accused Reform of copying their own plans.
The Liberal Democrats also rejected the proposals, saying they failed basic scrutiny.
The debate comes as Channel crossings hit record levels in 2025, with more than 28,000 arrivals this year and asylum claims rising to 111,000.
The Labour government, in power since last year, has pledged instead to target smuggling gangs and has agreed a new migrant return deal with France.