Would like help identifying this plant

Would like help identifying this plant

Observation - Would like help identifying this plant - UK and Ireland. Description: Tiny pink flowers on triple stemmed heads led me to think this might be Valerian, but there was no fragrance other than a horrid stench. The plants were growing up to 2-3 ft high alongside a small burn, in boggy ground and in the shade.

Tiny pink flowers on triple stemmed heads led me to think this might be Valerian, but there was no fragrance other than a horrid stench. The plants were growing up to 2-3 ft high alongside a small burn, in boggy ground and in the shade.