A sovereignty referendum was held in Gibraltar on 10 September 1967, in which Gibraltarian voters were asked whether they wished to either pass under Spanish sovereignty, with Gibraltarians keeping their British citizenship and a special status for Gibraltar within Spain; or remain under British sovereignty, with institutions of self-government.
The cancellation of the Treaty of Utrecht and the subsequent return of Gibraltar to Spain.
The presence of the British base in Gibraltar, its use being subject to a specific Anglo-Spanish agreement.
A "Personal Statute" for Gibraltarians, under United Nations guarantee, protecting their cultural, social and economic interest in Gibraltar or anywhere else in Spain, including their British nationality. An "appropriate [..] administrative formula" should be also agreed.
The Spanish offer had little chance of being accepted by Gibraltarians. At that time, the Spanish claim was being made by the Francoistdictatorship which had arisen from a bloody civil war which did not allow its own citizens the civil liberties that the British government guaranteed to the Gibraltarians. Furthermore, the Spanish economy, though beginning to grow, was still very backward (especially compared to the living standard the Gibraltarians had achieved), while at the same time working-class people across the frontier were living in a state of great poverty. Economic considerations aside, the idea of Spain participating in any way the sovereignty or government of The Rock was unacceptable to nearly all Gibraltarians.
^United Kingdom Secretary of State for Foreign Affairs (1966). Gibraltar talks with Spain (May-October 1966). Presented to Parliament by the Secretary of State for Foreign Affairs by Command of Her Majesty. London: Her Majesty's Stationery Office. p. 36.