Phase I of the EU ETS ran from 1 January 2005 to 31 December 2007. The UK’s National Allocation Plan for that Phase is available on the Defra: EU ETS - UK National Allocation Plan (Phase 1) web page.
The Plan sets out:
The Department for Trade & Industry (DTI, now BERR) commissioned various independent reports, providing analysis to help inform its policy decisions which can be found below: