Flower in Twickenham garden

Flower in Twickenham garden

Observation - Flower in Twickenham garden - UK and Ireland. Description: A pink geranium like plant has appeared in the flower bed. I would like to know what it is. It's an attractive plant.

A pink "geranium" like plant has appeared in the flower bed. I would like to know what it is. It's an attractive plant.