I think so, by the height of it. Charlock is the only other really similar one in that family, and it's much shorter.

Thanks Worthy, yes Charlock does look very similar, will have to look a little more into this one as I was going to produce a mustard from the seed.

Our Hon Sec. teaches Science. He says Mustard contains a chemical that is harmful to plant life.
I have always grown Fodder Radish for Green Manure.
There are other kinds.