I recently bought an electric one from Screwfix when it was discounted to £49.99. Although this looks good, finding it hard to justify a petrol one given that it’s likely to be used 2-3 times a year. screwfix.com/p/wr6002-1500-32cm-raker-scarifier-230-240v/296fg?_requestid=497825
That's the job for a lawnmower, this is for aeration of the ground and picking up the dead grass, but there are cheaper alternatives to this.
I’d spend the £299 on remedial classes for you.
It is used to remove moss from a lawn? If you don't know what it's even for how can you comment on the value.
some people like to have there grass tidy, not like a jungle. :D