Arghhh I wish I had listened to my first instinct, which was not to reply.
About 40 minutes after I received the text I did reply just saying:
Kids are fine, they had a good afternoon. D5 really loves her school friend doesn't she. She'll be made up when you tell her about the cinema trip next week.
I wish I hadn't now, though I don't think that particular text will have done much damage.
BD - 30TH JAN 2015 S - 30TH JAN 2015 PA CONFIRMED - 16TH FEB 2015 (SINCE AT LEAST OCT 2014) CONTINUAL TALK OF D ME: 31 W: 28 T: 10yrs M: 4.5yrs D:5, S:6