Picked up the boy from school earlier and his teacher took me aside and sheepishly

[Sir C]

I know. I was only being silly.

No, I insist that this minor misunderstanding was my fault for expressing myself clumsily, which put you in a difficult and potentially embarrassing situation.

I apologise unreservedly and will do all in my power to ensure that there is no repitition of this regrettable incident.