Wiggy.
Re blindline pref forms going straight in the bin.
I needed to fill one in myself the other month and followed it up with a phone call to pre-ops. I did this to reinforce how important the day off I wanted was (Ellen's birthday). During the conversation I said something slightly disparaging re pref forms and how little sway they seem to have.
The lady on the end took the time to list my last 5 forms submitted (over the course of several years) and read the succinct notes on the screen next to each entry citing why I hadn't got my preference.