Given the large number of questions on this site from people who removed a light switch and then were unable to reconnect it properly, removing all of the wires from a consumer unit and 'simply' reconnecting them is something that should not be attempted by DIYers, regardless of whether it is notifiable or not.
Seems reasonable to take the view that you cannot really argue against discouraging the disconnecting and then reconnecting by the DIYer - of a CU. Although some may be confident.