Thanks all. Very interesting and very useful to think these things through. I will get into the habit of holding onto the flaps lever for a second or two and mentally checking that all seems ok before going back to the throttle. Scary however to picture that situation while on a touch and go when you would not feel anything abnormal until you lifted off. No instructor has mentioned to me not operating flaps in a turn, that's something to consider as well; although to be honest, I don't think I would want it absolutely fixed in my head as a rule.