How do european (or perhaps just the UK's) legal system(s) work in that regard?
I have a lot of hope that this is a first crack appearing in the western cultural monolith; at some point civilized countries will have to somewhat politically break from the US so long as the US continues its domestic institutional torture programs (american prisons and the tradition of extended solitary confinement) and human rights violations (capital punishment). With luck that means that MLAT will eventually start to be unenforceable.