Open Europe recently published a list of the 100 most costly EU regulations. See this PDF.
Four directives account for 53% of what will be an £184bn cost by 2020:
- The Working Time Directive, to cost the UK economy £32.8 bn by 2020;
- EU's Climate Action and Renewable Energy Package, to cost the UK economy £28.2 bn by 2020;
- Energy Perfomance Certificates for buildings, a.k.a Home Information Packs, to cost the UK economy £20.2 bn by 2020;
- Temporary Agency Workers Directive, to be implemented in 2011 and set to cost the UK economy £15.6 bn by 2020.
More here.