This study explores the perceptions of Britain's main political parties towards the Palestinian Islamist faction Hamas throughout the period between 2003 and 2016. It explores also the extent of variation between the major political parties in the UK towards Hamas. The author argues that the lack of a value-based outlook on the part of the British ruling establishment as well as a lack of respect for the tenets of international law—which enshrines the right to resist occupation—have driven that establishment to embrace the UK's colonial legacy, and to regard their government as the founder and protector of the State of Israel. It is this establishmentarian discourse, argues the author, which drives the criminalization of Hamas within British politics.