My experience with EWO was positive. A HT threatened to report me to them because I pulled my DD out of her school, with a place secured to start at another school 3 days later. The HT said if I didn't take her to school the next day, she'd report me and get me prosecuted. So I reported myself! The EWO chuckled a bit, said she wasn't interested in the slightest with DD2's absence and said she'd make notes on the system that DD2 had a new school place starting in 3 days and was being kept home in the mean time.
As it happens, I was able to get her to start the new school the next day, in the end, as the new HT was super kind and the new teacher stayed late to get DD2's books, tray and peg ready for her.