Well of course not. It also isn't happening. It's made up.
Net migration reached a high of 906,000 in the year ending June 2023. However, it subsequently decreased to 728,000 in the year ending June 2024.
And of course that migration is almost all legal and government approved. It has nothing to do with the people desperately seeking asylum. In YE June 2024 84,000 people claimed asylum successfully but that number includes those arriving via regular routes as well. The peak was created by the new immigration system after leaving the EU and was entirely due to Conservative policies, although a lot of the bump is migration that was deferred due to Covid.