That is entirely irrelevant to the point, you suggested adding the second board as a way to dodge out of responsibilities, I pointed out that it added responsibility for the tails rather than removing any.
But in answer to your question, it would depend entirely on whether RCD protection is required or not. Seeing as this thread is discussing a commercial installation there is a good chance RCD protection is not required, and there is definately not a homeowner to contend with.
If a circuit breaker or fuse carrier is required which is obsolete then I would get one from a local wholesaler who has a large stock of such items.