The "eurocrats" are elected, there are elections for the eu parlement every 5 years. The 28 (soon 27) members of the european comission are proposed by the member states (eg their elected leaders) and approved by the european parlement. And finally the council of europe is made up of elected national ministers (per domain).
With regard to the rules: you would still have to comply to most of these rules to be part of the single market (which most leave proponents want to be). Studies from WTO and IMF have shown that not going that route (eg trading under WTO rules) would impact UK severely (up to 9% of the GPD). See for example https://www.imf.org/external/np/ms/2016/051316.htm
With regard to the rules: you would still have to comply to most of these rules to be part of the single market (which most leave proponents want to be). Studies from WTO and IMF have shown that not going that route (eg trading under WTO rules) would impact UK severely (up to 9% of the GPD). See for example https://www.imf.org/external/np/ms/2016/051316.htm