I think based on Johnsons speech last night they must mean Brexit and covid vaccines.
Happy for Labour to "take a sledgehammer to Brexit" I.e. clean up the mess.
Covid vaccines aren't even a thing for most people so I'm not sure what sledgehammer he means.
Plus,it just makes me think of all the things the Tories destroyed under "austerity" when they got in.
I am a bit concerned Starmer is about to launch austerity 2.0 on us though