The HS2 Action Alliance,
Buckinghamshire County Council,
Hillingdon London Borough Council, and
Heathrow Hub Ltd claimed that the Secretary of State should have done a strategic environmental assessment under Directive 2001/42 before the government's "Next Steps" Command Paper on
HS2. This proposed a
hybrid bill procedure in Parliament for constructing the
High Speed 2 railway from London to Birmingham (phase 1), and then on to
Manchester as well as
Sheffield and
Leeds (phase 2). The plaintiffs argued the Directive should be interpreted in line with the Convention on Access to Information, Public Participation in Decision-Making and Access to Justice in Environmental Matters 1998 (the
Aarhus Convention 2001) art 7. They also argued that a hybrid bill procedure did not comply with the
Environmental Impact Assessment Directive 2011/92/EU because the party whipped the vote, and limited opportunity to examine the information in Parliament. This was argued to fail the test for proper public participation under
EIAD 2011 article 6(4). ==Judgment==