Kay was born and raised in Aberystwyth, Wales. She was educated at Llandysul Grammar School and went on to study Biochemistry and Microbiology at King's College London, followed by a Ph.D. in medical research and an MBA from the University of Surrey.
Kay was elected as the Conservative MEP for Wales in June 2009. This saw the Conservative Party top the elections for the first time in Wales in modern history. A successful career in investment banking has equipped her with in-depth knowledge of the global financial markets. This, combined with her experience advising businesses in Europe and the US, has led to her appointment on the Economics and Monetary Affairs Committee in the European Parliament.