The Norfolk Marshes

We stopped at the East Bank (between Cley Marsh and Arnold's Marsh) on our way to Tesco for a spot of bird watching and managed to capture a rather blurry shot of a Sedge Warbler, but Blipfoto wouldn't load it...does anyone else have this problem?  It appears to load but is not there after hitting the publish button.

Does anyone know what the yellow flowers are?  I thought they might be escaped Oil Seed Rape?