Thanks for the replies. I had looked at other posts and concluded that a mix of Olfa blade, band saw, panel saw etc were individual responses to an occasional need. Because I can buy 48" rolls at an exceptional price and print with a 24" machine, I was looking for someone who has a regular need to cut rolls and has found a straightforward method that's some sort of industry standard way of doing it.
I don't mind paying for the right machine.