Seems like an extension of the existing cruel policy that keeps innocent people in jail because they won't "confess".
You need to be 100% sure of your criminal justice system before you start with bright ideas like that. And speaking personally, I would be terrified of any country that claimed it had a criminal justice system that was infallible. Especially when you look into history and see the countries that did so (starting with Germany in the 1930s).
And once you've decided your criminal justice system is infallible, why waste time with prisons. String the guilty up and save time.
Of course in your Brave New World you would end up not executing guilty criminals, because they hadn't revealed the location of their victim. Even if (a) they didn't do it or (b) there's no body to be found.
People need to think these things through. They won't, but they should.
Oh, and bear in mind Priti Patels entire reasoned and cogent argument as to how we prevent wrongful executions - as stated on Question Time a few years back was "DNA, innit ?". So I wouldn't be filled with confidence we'd get a measured response from government.