On 7 May 2015, the Conservative Party was elected to govern the UK for the next five years. Prime Minister David Cameron re-confirmed his pledge to negotiate amendments to the UK's membership of the EU, and to hold a referendum on whether to remain a member of the EU or to leave the EU. If the UK votes to leave the EU it will remain in the EU for a transitional period while arrangements are established between the UK and the remainder of the EU for the UK's exit from the EU (Brexit). This article considers some of the most significant potential legal implications of a Brexit on the regulation of financial services in the UK.