And that cost growth was in part due to adding a deep, Counter-Value strike Mission to a precision penetrator whose nav/attack fit was intended to find, not Moscow, but a tank. After deletion of Skybolt and adoption of Polaris, December,1962, TSR.2 Spec. drift piled on BAC X-12 and/or other stand-off weapons (ASMs), as it became a multi-role combat aircraft, the only game in RAF's town. Firstly Conservative, then Labour Ministers ratcheted down, from 150 to 50 their view of an affordable quantity. Wilson then offered to buy 50, but at a ceiling price, which Geo.Edwards declined. He “told Vickers’ Board (he) offered to complete (at further) £430Mn. and to sacrifice all profit if (it) exceeded that” H.Evans, Vickers Against the Odds,Hodder,78,P121. That equated to a blank cheque, and was declined.