I still cannot see how a cat b is back on the road, something is not right.
Agree. I wouldn't consider buying it.
Apart from the issue of whether or not it should be on the road, I doubt many (if any) insurance companies would insure you with it, so rather than it looking to be good value, it would be a really expensive mistake if you can't get insurance.
Also, think about when you want to sell it too; judging by the responses you've had, I don't think you'd get many takers as a private sale and I doubt the trade would want to know either.
Steer well clear. Definitely one to avoid!