the only mot's that you can access from the past now are the electronic ones, and they have only been around for a couple of years. the old written ones can only be traced by contacting the garage that did them, even then they are unlikely to have a copy by now.
as for the log books, you can apply to the dvla, and they can usually supply previous keeper information, but only back a certain amount of time IIRC.
the only way to track back to the original reg now would be to trace all previous keepers, quite a task given that it was imported 25 years ago now, most will have moved or passed away i would imagine.