They have three Horrid Henry Early readers:
Horrid Henry goes on Holiday
Don't be Horrid Horrid Henry
Horrid Henry Birthday party.
Suspect the titles might not be completely accurate but they give the complete gist. They are more like the reading scheme books in that they have bright illustrations and not too many words or sentances per page, but they do use advantage language in that some of the words werent really suitable for the level they were aiming at (IMO). But well worth a go, ds 4 likes to shre read them. (its a 40-60 split at mo hoping it will boost confidence and get him reading more).