Yellow daisy/ragwort like flower

Yellow daisy/ragwort like flower

Observation - Yellow daisy/ragwort like flower - UK and Ireland. Description: Tall (30cm+) plant with linear leaves clasping stem. Flower/bud resembles ragwort. On shingle.

Tall (30cm+) plant with linear leaves clasping stem. Flower/bud resembles ragwort. On shingle.