Flower in hedgerow

Flower in hedgerow

Observation - Flower in hedgerow - UK and Ireland. Description: This yellow flower I first identified as Tormentil from the leaf but my book says tormentil alomst always has only 4 petals - this flower has 5 which suggests it may be creeping cinquefoil but the leaves seem to be too rounded for that. I therefore welc

This yellow flower I first identified as Tormentil from the leaf but my book says tormentil alomst always has only 4 petals - this flower has 5 which suggests it may be creeping cinquefoil but the leaves seem to be too rounded for that. I therefore welcome suggestions.