Winder

The Winders were the combined maintenance workers (REF: The Brilliant Book 2011) and police force of Starship UK. They were cyborgs, half-human and half-Smiler. Their heads would rotate to reveal the malevolent version of the Smiler face, with a lighter skin tone, whiter teeth, flat nose and brighter eyes. Most of the time they wore dark hoods and acted like normal humans, keeping watch on the population. They were under oath to protect the system of Starship UK. (DW: The Beast Below)

When the Eleventh Doctor and Amy came to Starship UK, the Winders reported the Doctor's presence after he began investigating the engines. Later, when they learned of the truth, the Winders brought them to Hawthorne to learn the whole story. (DW: The Beast Below)

Behind the scenes

 * According to The Brilliant Book 2011, a non-canonical REF book; the Winders also had a key attached to a black cord around their necks. This was to wind up the clockwork technology that ran Starship UK, and was their alleged primary purpose. At some point the Winders had taken control.