Which brings up an interesting point for aeroplanes on the UK register.
I understand that you can either opt for a Notice 75 schedule or operate to the manufacturers schedule, then overhaul.
I once looked at a Zlin that hadn't had a Notice 75 for 5 years, it's C of A had been renewed because it was operating to the manufacturers overhaul schedule.
Comments welcome because I detest the thought of doing Notice 75's on a perfectly serviceable prop.