How to install a bathroom cabinet on a plasterboard wall

In this video I install a bathroom cabinet with mirrored doors onto a plasterboard wall that is only three inches thick, often called an egg box partition because the plasterboard is filled with pieces of cardboard. A cabinet like this can be heavy once filled and so it is essential that it is fixed correctly, so I use blue Grip it fixings, which can hold approximately 90kgs each. Grip it fixings are now widely available-