It is a garden yellow rocket - Barbarea vulgaris.. See the following for more info:
Thank you! Your expertise is much appreciated.
This was the first year I noticed this plant and it didn't match any descriptions of plants that were originally planted in this swale.
I am glad I could help. You never know what blows in with the wind or is brought in by animals.
Thanks for your tip about Google Lens. I just started using it and it is amazing. This is just what I was looking for. Now I can identify plants, birds, etc. when I'm out on walks.
Glad you find it useful. It isn’t perfect, but I think it is about as good as the paid plant ID programs and it does work on lots of other stuff.