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It's the right time of year and habitat, and the photo looks pretty good for phragmitidis in terms of general shape and colours; the only thing that makes me hesitate is that my specimens all have a dark ring towards the end of the femora, which I can't see on your photo.

As far as I know the only alternative would be Limonia stigma, which I've never seen - it is supposed to be much rarer than phragmitidis and associated with drier woodland, but it does have a smaller dark apical ring on the femora. It's also supposed to have two spots on the wing as opposed to three for phragmitidis, but I can't make out from the photo which are spots and which are just darkened veins.

Have you got any other photos? Might be worth sending the photo/s to John Kramer (UK cranefly recording scheme) if no-one can give a definitive answer here.

Martin