Unknown plant growing on the canal bank

Unknown plant growing on the canal bank

Observation - Unknown plant growing on the canal bank - UK and Ireland. Description: In damp ground on the bank of the canal. I first thought it was Mimulus but only the colouring is similar. Leaves, buds and stems are different- more like Balsam

In damp ground on the bank of the canal. I first thought it was Mimulus but only the colouring is similar. Leaves, buds and stems are different- more like Balsam