SmartSwitch Lite doesn't fit in the back box

With some types of UK back box, particularly plastic ones, it might be difficult or not possible to get SmartSwitch Lite into the box and/or seat it on the mounting plate. This is most likely to do with unnecessary protrusions on the ears of the back box.  These can be trimmed away with a knife or cable cutters, which should not affect the integrity of the back box.