Got my letter this morning and I think I've fucked up big time 
Mines is the childcare one. Had new baby (DD2) in November, updated all fine. My childcare costs were £27 pw until DD1 got a place at the funded nursery in January. Taken into hospital and stayed for 3 weeks, during this time tried calling HMRC wrt nursery but no national insurance number to update with in hosp.. My mind was in a horrible place too, drugged up day and night, in constant pain, couldn't walk or take myself to the toilet, and had a newborn to look after in hospital with me.
I went on entitled to and because of mat pay my income had dropped so low (which I also obviously hadn't updated on) that it all balanced itself out if that makes sense? So come the renewal in April I thought I'd just tell them childcare had stopped in Jan, but wages were significantly lower for that tax year than the predicted amount they were using anyway so I would probably have been underpaid if anything.
Now I'm absolutely terrified I'm going to get done for fraud and slapped with a huge fine. Can't believe I've been this stupid, I did my renewal the other night and corrected all my info.
The letter refers to a leaflet enclosed but I didn't get one? Also, it doesn't ask for anything document wise, just a form type thing to fill in is this normal?
God what an idiot
if I thought I was being overpaid I would have obviously tried harded to update. No one to blame but myself, does anyone know what they do in these types of situations? It obviously looks like I've been caught out and was going to keep it covered up but I really wasn't!