when will Rudding Park, Harrogate course map be updated? Other cheaper gps systems updated within days but not Garmin?

Have you reported the course is needing a correction through the golf course report form on the site? 

If needed, you can access the form here: https://www.garmin.com/forms/golfcourses/

Once reported, the update becomes available once the next bundle of course maps containing the change is available with that map update on it. The email also used when you submit the report for the course is notified once the update becomes available as well.