Nicola Walker (born May 15, 1970) is a British actress, known for her roles in Spooks (2003-2011), Last Tango in Halifax (2011-) and Unforgotten (2015-). She portrayed Panhead's mother in the 2004 film Thunderbirds.
She would later go on to feature in Anderson Entertainment's First Action Bureau, alonside Genevieve Gaunt, Sacha Dhawan and Paterson Joseph.