was imposed on the rest of the UK. Ideological tensions inside the SNP are further complicated by arguments between the so-called SNP gradualists and SNP fundamentalists. In essence, gradualists seek to advance Scotland to independence through further devolution, in a "step-by-step" strategy. They tend to be in the moderate left grouping, though much of the 79 Group was gradualist in approach. However, this 79 Group gradualism was as much a reaction against the fundamentalists of the day, many of whom believed the SNP should not take a clear left or right position. Economy During the 1970s the SNP campaigned widely on the political slogan It's Scotland's oil, where it was argued that the discovery of North Sea oil off the coast of Scotland, and the revenue that it created would not benefit Scotland to any significant degree while Scotland remained part of the United Kingdom. The Sturgeon Government in 2017 adjusted income tax rates so that low earners would pay less and those earning more than £33,000 a year would pay more. Previously the party had replaced the flat rate Stamp Duty with the LBTT, which uses a graduated tax rate. Whilst in government, the party was also responsible for the establishment of Revenue Scotland to administer devolved taxation. Having previously defined itself in opposition to the poll tax the SNP has also championed progressive taxation at a local level. Despite pledging to introduce a local income tax the Salmond Government found itself unable to replace the council tax and the party has, particularly since the ending of the council tax freeze under Nicola Sturgeon's leadership, committing to increasing the graduated nature of the tax. Conversely, the party has also supported capping and reducing Business Rates in an attempt to support small businesses. It has been noted that the party contains a broader spectrum of opinion regarding economic policy than most political parties in the UK due to its status as "the only viable vehicle for Scottish independence", with the party's parliamentary group at Westminster in 2016 including socialists such as Tommy Sheppard and Mhairi Black, capitalists such as Stewart Hosie and former Conservative, Tasmina Ahmed-Sheikh. Social justice When Robin Cook MP moved an amendment to legalise homosexual acts to the Bill which became the Criminal Justice (Scotland) Act 1980, he stated "The clause bears the names of hon. Members from all three major parties. I regret that the only