What would be the point of doing that? The boats are all confiscated when they arrive on the English coast. They cannot be used again. Taking the illegal immigrants off the boats at sea and sinking the inflatable rubber dinghies (which won't actually sink and could get caught up in the propellers of ships etc) wouldn't change anything. The people removed from the boats by the Navy would have to be taken to England where they would claim political asylum (as we don't have permission to take them back to France), so the problem would be unaffected.
The British authorities have been seizing the boats for years. They are cheap and nasty mass-produced rubber dinghies. They are expendable and the international people-smuggling gangs can always get more of them.
If it were up to me, I would arrest the refugees that arrive and put them in secure detention camps (not hotels, as is the current practice). Those that have no reasonable political asylum claim should then be swiftly deported.
When Britain was a member of the EU it had the legal right to deport all of these boat people back to France etc. However, the previous Conservative government of that time utterly failed to make proper use of that right.
The problem is the French government. They were given £1.6 billion since 2018 by the British government for extra policing along the coast and drone surveillance etc to stop these boats, but they keep coming. £476 million was given to them for this purpose since 2023. They are still pissed off with us over Brexit and allowing illegal immigrants to go to the UK is a win for them as it means they don't have to support/process them.
And as much as you mock Reform, how, exactly, would it have been worse than what an unchecked Labour has made of the UK?
Labour are useless because they are simply not ruthless enough. Starmer could force through changes with his huge parliamentary majority, but he wimps out when his backbenchers rebel. For example, they have failed to clamp down on benefits designed to secure the votes of pensioners (many of whom are wealthy) and on people who don't work but just have numerous kids for the extra child tax credits. However, Labour has only been in power for under 2 years, whereas the last Conservative government was in office for over 14 years and so it has to accept responsibility for a lot of the current mess.
Reform is basically just a protest vote. Most of their candidates are newbies with zero experience of public office and zero chance of getting into power on their own merits (unless they are riding a wave of stirred-up populist anger). The only positive of them is that if the two major political parties feel they are going to lose a lot of seats to Reform they will toughen up their policies in the run up to the next General Election and stop the piss-takers (career welfare claimants, bogus political asylum seekers, tax-dodging corporations et al.).