Always seek permission from C in C Home Forces before using equipment she regards as hers.
Just this evening I did ask permission to use the iron on some thin calico I am using as ships boats tarpaulins. She kindly reminded me of what setting to use.
Strange, she comes home expecting me to have ironed my shirts, for which a Chit is not required. If I have not anticipated her unspoken command I am likely to be on a charge.