This would be my worst nightmare as a SENCO. I work 4 days, only have 8 EHCPS in a school of 440.
But have numerous referrals and children in the system that I am supporting/ battling for. Also applying for 4 new EHCPS, I teach year 3, I am LAC lead, Phase Leader, in the DS team and member of SLT. I have around 70 children and families that I am supporting and am always called to daily behaviour issues... some of which generate huge amounts of paperwork that needs to be actioned imnediately. I also manage cover, lunchtimes, playtimes and a team of 20 LSAs and cover classes when teachers are sick.
I have my annual review dates listed now and I do read EHCPS and I ensure I have a good relationship with my EHCP children and parents, but as the demands have grown, I worry I will not be able to sustain this. My parents are also really on it and will chase the LA themselves. I was once 2 weeks late for an AR and I felt terrible.
I also rely a lot on my LA who send AR date reminders, but they often are really, REALLY delayed in sending through the changed/ updated EHCPs and especially the funding.... if the school have apologised and held their hands up and your child is now receiving what they should- surely sometimes we are only human and trying our absolute best.
Your complaint, and the SENCO realising, could be enough to ensure noone else falls through the net.