The West Shetland Basin is characterised by challenging climatic conditions and limited existing infrastructure. Companies have brought a small number of oil fields onstream and Total started production from the first gas fields, Laggan and Tormore, in 2016. However, much of the basin is under-explored and considered frontier. It is under-explored compared to the rest of the UK continental shelf (UKCS), and there is potential to make sizeable discoveries (in terms of the UK) in the future. The largest discovery under our assumptions is 150 mmboe on the Judd High, while explorers are actively looking to ‘break’ the creaming curve on the Rona Ridge play.