1MT Green Bamboo physics package was begun in ’55 for Avro 730’s Blue Rosette gravity bomb, later for Blue Streak IRBM, Blue Steel ASM and Yellow Sun (to be) Mk.1 for Mk.1 Victor/Vulcan, and for the ASM schemes (W.107, HP.106) to follow Blue Steel Mk.1. Tested as Orange Herald (Small) 5/57 at 0.72MT, it was abandoned for 3 July,58 US/UK MoU, by which Mk.28 became Red Snow in Blue Steel, Yellow Sun Mk.2.

TSR.2 was to have BAC X-12 Pandora ASM and WE.177B, secondary warheads derived from Polaris A1 W-47 (600KT). Primary would be UK-solo Tony/RO106.
(Mostly: Brian Burnell’s http://www.nuclear-weapons.info/vw.htm#WE.177)