Editing Vickers Valiant (section)

===Tanker operations===
Valiant tankers were flown by No. 214 Squadron at [[RAF Marham]], operational in 1958, and No. 90 Squadron at Honington, operational in 1959.<ref name = "hub and sim 26"/> The two squadrons became dedicated tanker squadrons on 1 April 1962.<ref>Brookes 1982, p. 142</ref> Aircraft assigned to the tanker role were fitted with a Hose Drum Unit (HDU or "HooDoo") in the bomb bay. The HDU was mounted on bomb-mounting points and could be removed if necessary; this arrangement meant that the bomb bay doors had to be opened in order to transfer fuel to a receiver aircraft. A control panel at the radar navigator station in the cockpit was used to operate the HDU.  The HDU equipment was removable so that the aircraft could be reverted to the bomber role if required.<ref>Tanner 2006, pp. 113–114.</ref>

Long-range demonstration flights were made with in-flight refuelling by other Valiant tankers that had been positioned at airfields along the route. In 1960, a Valiant bomber flew non-stop from Marham in the UK to Singapore and in 1961 a Vulcan flew non-stop from the UK to Australia.<ref name = "hub and sim 26">Hubbard and Simmons 2008, p. 26.</ref> The two tanker squadrons regularly made long range flights. These included non-stop flights from the UK to [[Nairobi]], [[RAF Gan]] and [[Singapore]].<ref>Brookes 1982, pp. 141–142</ref> Other aircraft refuelled by Valiants at this time included Victor and Vulcan bombers, [[English Electric Lightning]] fighters, and [[de Havilland Sea Vixen]] and [[Supermarine Scimitar]] fighters of the Royal Navy.<ref>Wynn 1994, p. 168.</ref>