I dont have an answer for the "TO" bbb.
But rules do state "IF an appropiate class exists, all vehicles must run in that class. Any vehicle, which is not legal for any class, but meets all technical regulations, will run for Time Only."
Even if TO, part of the Technica Regulations is a number plate rule 7.B.1. But I just may not be able to see it.
And two of the three ran in a class for points which the entrant gets and the club they belong too gets... I dont know about the third because there is no number visible.
Jon