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KALIS London is a city. Westminster is the English and British Parliament, and also the name of the British system of democracy. Scotland has its own parliament for legislating Scottish law.
Scottish law is different in many respects. For instance, in Scotland a person arrested for a crime is guilty until proven innocent.
As for the oil, all of Britain is acutely aware that the days of fossil fuels are numbered. BP (British Petroleum) is already investing and preparing for the changes. Massive arrays of offshore wind-turbines are now producing cheaper and cleaner power. Within the next 10 to 30 years, fossil fuels will become obsolete.
If you're really curious about why the Scots, Welsh and Northern Irish remain part of the UK (despite many protesters) read their online newspapers or look up Wiki. Real answers come from research. Social sites are the least reliable place to get facts.