Oh ok. I guess that sort of is a feature, but on winter there's a lot more white. I tend to go off giss (general impression of size and shape), colour and tail. Winter's are very compact and round, with a tiny tail that's often cocked up, overall winter are much darker as well. Sedge is cleaner above and below, and they have fine streaking running lengthwise down their back. Instead of brown, I find them to be more of a light straw colour, which is pretty uniform across their whole body, except some pretty clean white on the underparts. Sometimes Marsh and Sedge can a be a little tricky to separate, but Sedge is much lighter, and shows different back patterning, and a less bolded supercilium. Once you get the hang of it, wrens aren't so bad. Hope this helped for the future!