[skissane]

The EU has a rule (Common European Asylum System) that you have to claim asylum/refugee status in the first EU country you arrive in. The UK benefited greatly from this rule while in the EU - anyone entering from France and claiming to be a refugee, they could be sent straight back to France, and under this EU rule France had to accept them.

Post-Brexit, once an asylum seeker in France makes it to the UK, France is no longer under any legal obligation to take them back, so they refuse. There isn't anything in it for them.

It also has rules about spreading the burden, so once a refugee claim is accepted, governments can then forcibly transfer them to a different EU country. Post-Brexit, the UK government can only transfer refugees to EU member states if they agree to receive them, and why should they, what is in it for them?