By the Act, Community Law (subsequently European Union Law) became binding on all legislation passed by the UK Parliament (and also upon the UK's devolved administrations—the Northern Ireland Assembly, Scottish Parliament and the Welsh Parliament (Senedd Cymru) although none of these institutions existed at the time of the passing of the Act). Arguably it was the most significant statute to be passed by the Heath government of 1970–1974, and one of the most significant UK constitutional statutes to ever be passed by the UK Parliament.