Question: In the country where the sandwich named after the organization that preceded National Rail is from, who picks the Prime Minister?

<P0-S0> The British Rail sandwich has been used as a negative point of comparison for other ready-to-serve meals, especially regarding transportation in the United Kingdom, and representative of the negative effects of British nationalisation of industry in the middle of the 20th century. <P0-S1> A 1997 article in "The Independent" referred to the sandwich as "an indictment of statist, bureaucratic corporations" privatised by Prime Minister Margaret Thatcher, who had "swept aside James Callaghan, prices and incomes policies and the British Rail sandwich". <SEP> <P1-S0> APTIS was the Accountancy and Passenger Ticket Issuing System used on the British Rail/National Rail until 2007. <P1-S1> It was originally called "Advanced Passenger Ticket Issuing System" as it was being developed at the time of the Advanced Passenger Train. <SEP> <P2-S0> Prime Minister of the United Kingdom of Great Britain and Northern Ireland Royal Arms used by Her Majesty's Government Incumbent Theresa May since 13 July 2016 (2016 - 07 - 13) Government of the United Kingdom Office of the Prime Minister Style Prime Minister (informal) The Right Honourable (within the UK and the Commonwealth) His / Her Excellency (in international correspondence) Member of Cabinet Privy Council European Council British -- Irish Council Reports to Parliament Residence 10 Downing Street Chequers Seat Westminster Appointer Monarch of the United Kingdom Term length At Her Majesty's pleasure Inaugural holder Sir Robert Walpole as First Lord of the Treasury and de facto first Prime Minister. <P2-S1> Formation 4 April 1721 Salary £151,451 annual, including £76,011 MP's salary Website Official website <SEP> <P3-S0> the united nations designates tuvalu as a least developed country (ldc) because of its limited potential for economic development, absence of exploitable resources and its small size and vulnerability to external economic and environmental shocks. <P3-S1> tuvalu participates in the enhanced integrated framework for trade-related technical assistance to least developed countries (eif), which was established in october 1997 under the auspices of the world trade organisation. <P3-S2> in 2013 tuvalu deferred its graduation from least developed country (ldc) status to a developing country to 2015. prime minister enele sopoaga said that this deferral was necessary to maintain access by tuvalu to the funds provided by the united nations's national adaptation programme of action (napa), as "once tuvalu graduates to a developed country, it will not be considered for funding assistance for climate change adaptation programmes like napa, which only goes to ldcs". <P3-S3> tuvalu had met targets so that tuvalu was to graduate from ldc status. <P3-S4> prime minister, enele sopoaga wants the united nations to reconsider its criteria for graduation from ldc status as not enough weight is given to the environmental plight of small island states like tuvalu in the application of the environmental vulnerability index (evi). <SEP> <P4-S0> it is led by the prime minister of slovakia, who is nominated by the president of slovakia, and is usually the leader of majority party or of majority coalition after an election to the national council of the slovak republic. <P4-S1> the cabinet appointed by the president on recommendation of the prime minister must gain a vote of confidence in the national council.