Okay, back to this old chestnut.
"I'm splashing some cash on my favourite niece," I said, affecting a grimace.
I keep changing between 'effected' and 'affected'. Reviewing a few grammar websites, my understanding is that it should normally be 'effected', but 'affected' is to be preferred when referring to facial expressions.
What do you editors and proofreaders think? Would you flag either as an error and, if so, for what reason?