Another I have seen a few times is strip connectors (choc blocks) in loft and floorboard spaces without an enclosure. Would that fail an inspection? 

It should - screw terminals have to be accessible, and accessible terminals and places where the outer jacket of a cable is removed need an enclosure ?

Now that ‘enclosure’ may be the void behind a wall light or something, and the fitting forms the screwed access ‘cover’  and the brickwork forms the other 3 sides. However, some thought is needed as to if that is wise,  a dry brick wall is probably OK being fire proof and insulating, a hollow partition with duplex board or a hole in the plasterboard under a wooden floor really isn't so clever. 

Now in practice choc block flapping between floor and ceiling next to heating pipes etc are unlikely to pose an immediate danger, but it is very poor practice, accessible or not, and should be corrected when found.

The same  choc block or sprung terminal connector  flapping about  in a  90p box that gives a degree of cable grip and covers the stripped ends of the cable so that only jacket is exposed is perfectly OK, so it is not hard to do better.

Mike.

Another I have seen a few times is strip connectors (choc blocks) in loft and floorboard spaces without an enclosure. Would that fail an inspection? 

It should - screw terminals have to be accessible, and accessible terminals and places where the outer jacket of a cable is removed need an enclosure ?

Now that ‘enclosure’ may be the void behind a wall light or something, and the fitting forms the screwed access ‘cover’  and the brickwork forms the other 3 sides. However, some thought is needed as to if that is wise,  a dry brick wall is probably OK being fire proof and insulating, a hollow partition with duplex board or a hole in the plasterboard under a wooden floor really isn't so clever. 

Now in practice choc block flapping between floor and ceiling next to heating pipes etc are unlikely to pose an immediate danger, but it is very poor practice, accessible or not, and should be corrected when found.

The same  choc block or sprung terminal connector  flapping about  in a  90p box that gives a degree of cable grip and covers the stripped ends of the cable so that only jacket is exposed is perfectly OK, so it is not hard to do better.

Mike.