Net cost or benefit for the UK economy?

Over half of UK legislation is EU-initiated. An analysis of government
Regulatory Impact Assessments allows quantification of some,
but by no means all, of the costs, but not the benefits, of EU
legislation. Dutch research, and UK survey evidence, looks to be
consistent with the RIA-derived estimates.
Scoreboard
Net Cost or Benefit Net Cost
Most Likely Net Cost Two per cent of GDP
Range of Estimates One to three per cent of GDP
Reliability of Estimate B
The British government admits that ‘about half of major UK laws
start off in Europe’. In addition, 1 since 1973, it has enacted directly
in the UK a minimum (it does not know the precise number) of
101,811 EU regulations.2 Clearly, the impact of EU legislation in
the UK is on its way to fulfilling the prediction made over a decade
ago by Jacques Delors, that 80 per cent of member states’ laws
would soon be made in Brussels.