Well, this isn't about space, or science, it is about ossifying the facility. So in a few hundred years, your great, great, great....grandkids can wonder why the fuck somebody wanted to expensively preserve a big chunk of meccano, and a few manky buildings. And they'd be right to wonder when the REAL HERITAGE of Jodrell Bank is science and learning, neither of which will be furthered or celebrated by bimbling around long-dead buildings, listening to short, dull audio explanations.
Britain has a national obsession with "preserving stuff for the nation", but I'm wholly unconvinced of the need to keep on adding to the tally. Or if we do need to, then lets drop and equivalent size place off the bottom of the list, rather than growing it forever. There's some bloody dull old buildings in the care of the National Trust, I'm sure they could be "unpreserved" to the benefit of the world.