I have purchased a BG consumer unit (the one on offer at Screwfix with 10 MCBs for not much money).
It has 'quarter turn' fasteners for the front cover.
By pressing my finger on them and turning, I can undo them and remove the front cover without the use of a tool.
The busbar shield further just pushes on so can be pulled off, again without use of a tool.
Compliant? Safe? Sensible?
Owain