That's even more intriguing. I assume sadly that it would now be under "Crown Copyright", which is like normal copyright but in just about every respect worse - for one thing Crown Copyright has no time limit. https://en.wikipedia.org/wiki/Crown_copyright
I'm not sure it would, this IP wasn't "prepared or published by or under the direction or control of Her Majesty or any government department".
At a guess: somewhere in between "probably nobody cares" and "clone quickly if you're interested"...
The company also haven't been around since 1986, so unless there is some litigious people who used to work there/owned the company, it's hard to imagine someone will do something substantial about this repository.
Litigious people: check.
Working with some strange partners, you don't want to mess with: check.
The second repository of this user seems to have been hanging on GitHub for years (judging by commit history; could have been uploaded later). Still, it seems so far that no one cares about this repo.