fuseholder for 6x32mm fuses - fuseholder 236-5731 rated to 16A,
(...)
a Circuit Breaker For Equipment

Hmmm. Both the suggested fuseholder and the CBEs are very deep and couldn't
be flush mounted in the space available. However, I have noticed item
360-7272, which should do the trick, though. Takes 10x38 fuses (where 16A is
readily available) is rated for 30A (most fuseholders seem to have a 6.3A or
10A rating) and is base mounted, so can be stuffed inside a prepared flush
mounting box.

However, are you allowed to have base mounted fuses that require the user
(even though it is myself) to unscrew the box lid and have access to the
live feed? (Presuming they aren't sufficiently clued up to throw the
isolator).

Christian.