Very common all round Britain on coastal rocks. A component of the yellow Xanthoria/Caloplaca zone above the black Hydropunctarai maura zone on rocky shores. The bright yellow-orange thallus is often fragmented and may have a lobed margin and dark orange apothecia

References: 
Schumm, F. & Aptroot, A. (2019) Images of the Lichen genus Caloplaca, Volume 3
Smith, C.W. et al. editors (2009) The Lichens of Great Britain and Ireland
Dobson, F.S. (2018) Lichens: an Illustrated Guide to the British and Irish Species