I've been working freelance as a writer and editor for a long time, mostly in the charity sector. I'm now signed up with a commercial agency that does B2B and customer oriented writing for banks, shampoo brands etc. They've asked about my daily rate and I'm not sure what to say. They're bound to pay better than the not-for-profit sector but I don't want to overprice myself either. I know they think £250 a day for copy editing is reasonable. What would you ask for writing per day?