Forgot to add that I'm slowly working on 723 errors in my watchlist (I started out with 201 !!!) and the good thing is you can do 5-10 when you have a spare 10 minutes.
I've also managed my impulse to start investigating and adding sources etc etc, and just concentrated on the simple errors, so should at least half that list by the end of the week, if not get it down further.
So thanks Robin, it has been a great idea to work on pre-1500 suggestions in this way.