Yep agree with David. One now has to constantly check and reset the setting. Very annoying. 

Where is the Email notifications page please?  

I read Callum's instructions. However, there is no option visible to me that says "Apply these settings to items currently on my Watchlist". There is only "Always use this option". I tick my time preference, I then tick, "Always use this option". But when I leave the page, the my reminder setting goes back to "None".