314.1 , 314.2. No it doesnt mean each circuit must be controlled by its own RCD, account must be taken of the install and its use, if required, a split board can still be used, even an upfront single RCD could be compliant.

314.1 (i) avoid danger and minimise inconvenience, - having all socket outlets going off due to an aplliance fault may be no more inconvenient than getting up, unplugging the errant device, then resetting the RCD. If, however there was a dialysis machine, or, indeed, an important internet server on those same bank of circuits controlled by one RCD, then it could be rather more of an inconvenience.

It all boils down to the design for the intended User. Offering a Consumer Unit full of RCBOs could also be a bad design,when replacing an old fuse box,  in that it would work, technically, as required, but the cost to supply and fit may be more than the Customer can afford, so they will not take up the offer of fitting it, whereas fitting a 2 RCD consumer unit, at £100 less, could be affordable to them, and wold make their use of the installation far safer, with a little inconvenience if ever there was a fault.

So, basically, good design for the intended use is what is required, and no, a full RCBO consumer unit is not required in every installation.

314.1 , 314.2. No it doesnt mean each circuit must be controlled by its own RCD, account must be taken of the install and its use, if required, a split board can still be used, even an upfront single RCD could be compliant.

314.1 (i) avoid danger and minimise inconvenience, - having all socket outlets going off due to an aplliance fault may be no more inconvenient than getting up, unplugging the errant device, then resetting the RCD. If, however there was a dialysis machine, or, indeed, an important internet server on those same bank of circuits controlled by one RCD, then it could be rather more of an inconvenience.

It all boils down to the design for the intended User. Offering a Consumer Unit full of RCBOs could also be a bad design,when replacing an old fuse box,  in that it would work, technically, as required, but the cost to supply and fit may be more than the Customer can afford, so they will not take up the offer of fitting it, whereas fitting a 2 RCD consumer unit, at £100 less, could be affordable to them, and wold make their use of the installation far safer, with a little inconvenience if ever there was a fault.

So, basically, good design for the intended use is what is required, and no, a full RCBO consumer unit is not required in every installation.