I would think that question has been addressed as well as is possible, but, in any event ...Although I am still confused as to whether or not the current labelling complies to latest regs
My personal view is that far more important than whether the situation "complies with the latest regs" is the question of whether or not you know which MCB supplies which circuits (and which sockets etc.), so that you (or whoever) would know which one to switch off 'in an emergency'. If you don't think that is currently the case, then either you or someone else should do whatever is necessary to ensure that you have that information/knowledge, should you ever need it.
Kind Regards, John