Wildflower I.D

Any help would be appreciated I'm trying to create a native plant bee haven in one corner of my garden.
While out with the dog I came across this flower and was curious to find out what it was.
It was growing next to a beck if that helps.

 

Looks like Rosebay Willowherb

https://en.wikipedia.org/wiki/Chamerion_angustifolium

 

Thank you for your response after a bit of research it looks like it may be a bit too much hard work to keep under control