Posted: 18/09/2017 at 09:44
Think there are several types of tools that get called scarifiers nowadays.
We have one which has two interchangeable 'things' .... one has a lot of spikes ... more of an electric rake really ... this is great for raking out moss and thatch.
The other has blades and this cuts into the surface of the soil and this helps to lessen surface compaction, allows air and moisture in and stimulates the roots to grow. This is really the 'scarifier'.
Both 'things' can be set at various heights according to the needs of your lawn.
Found it! This is ours http://www.screwfix.com/p/titan-ttb428gdo-32cm-1300w-lawn-scarifier-230v/48162