Custodian helmet
From Tardis Wiki, the free Doctor Who reference
A custodian helmet was a protective helmet famously worn by constables and sergeants of the police.
Gustave Lytton and his henchmen dressed as police, Lytton with a peaked cap and his henchmen wearing custodian helmets. (TV: Resurrection of the Daleks [+]Loading...["Resurrection of the Daleks (TV story)"]) The Sixth Doctor wore one after defeating one of Lytton's henchmen. (TV: Attack of the Cybermen [+]Loading...["Attack of the Cybermen (TV story)"])
A policeman wore a custodian helmet when he was suddenly dragged inside and killed by the Tremas Master, whose TARDIS had materialised around a police box. (TV: Logopolis [+]Loading...["Logopolis (TV story)"])
