Water Mint?

Water Mint?

Observation - Water Mint? - Global. Description: On chalk downland, but still a good 45cm in height in total, with a slight peppermint smell, though could just be plain mint knowing my nose! I'm always surprised to find water loving plants on the Downs & though I wouldn't rule it out completely I just

On chalk downland, but still a good 45cm in height in total, with a slight peppermint smell, though could just be plain mint knowing my nose!
I'm always surprised to find water loving plants on the Downs & though I wouldn't rule it out completely I just can't convince myself it definitely is water mint. Corn mint maybe? But the flowers/arrangement don't look right.