Hard to see how the Royal Navy will change the situation much. I had not heard that there was a problem with migrant boats slipping in under the radar or out-running the border patrol boats.
Its the old political fallacy - “Here’s a problem, we must be seen to be doing something; here’s something, we must do it.”
Maybe Boris Johnson will survive. It would be a huge task to turn his mess around before the May elections when his MP’s will be forced to come to a judgement. He can claim to have been focussed purely on covid for most of his term so far. And that now covid is weakening he’s simply and honestly trying to stand by manifesto commitments. He might get away with it.