I know this is the RSPB but can I ask a plant question he he
Saw a yellow flowered plant near the path that's sort of on the other side of the reed beds to the centre and not knowing much about flowers I've tried to look it up and it looks most like Wild Cabbage. However from what I can see this is not supposed to be as far north as this, so could this be what it is or is it likely to be something else?
We planted some Kale as part of a wild bird seed mix at the far side of the reedbed. Some of this is still in flower, so it is likely that this is what you saw.
I've put a (not very good) picture in the gallery. The pictures I've seen on the web of Kale look different but maybe there are different varieties.
I think that is the Kale.