Yellow flower in Llanberis

Observation - Yellow flower in Llanberis - UK and Ireland. Description: More than 4 petals (no photo), common in the Llanberis slate quarries and on the lower SW facing slopes of Llanberis Pass near the quarries

More than 4 petals (no photo), common in the Llanberis slate quarries and on the lower SW facing slopes of Llanberis Pass near the quarries