Yellow wild flower ID please.

Got a few of these flowering along the grassy banks of a stream at work. They're providing a lovely splash of colour at the moment, but what are they?

 

Flowers look like oilseed rape, not sure about the leaves though, has it escaped from some farmland nearby?

 

Look lovely, whatever they are

 

Definitely not oilseed rape, acres of that stuff growing round these parts, so I see enough of that to know exactly what it looks like.

The plants are considerably shorter than rape, maybe 2ft or so in height.

 

I'd say it was definitely a member of the brassica family, it's got the same 4 cruciform petals in the flower.

This is a pic of oil seed rape leaves

 

Certainly in the Crucifer family though, with flowers of that shape.

 

Look at images for mustard.
http://maggiejs.ca/wp-content/uploads/2012/12/Mustard_Plant.jpg

 

https://www.google.co.uk/search?q=m...a=X&ei=mFZWVdKyAure7Aaw_IPoBA&ved=0CAYQ_AUoAQ

 

Oh Pete, you added a link after
To be fair though, there 'are' plants on my link too

 

How about purple sprouting ?

 

Sorry I cant put links up off my phone :(

 

Still trying to work this one out. I'm leaning towards Charlock, or Wild Mustard but the leaves don't look right and my plant seems to have a more compact, bushy habit.

Think we need some help from @Zigs on this one.

 

Charlock is nearest, leaves are usually hairier and more serrated though

Not near me books at the moment.

 

It's Wintercress, Barbarea vulgaris.

 

Good spot KingEdward