Labour's incremental embrace of a distinctive Welsh polity was arguably catalysed in 1966 when Plaid Cymru president Gwynfor Evans won the Carmarthen by-election. In response to the emergence of Plaid Cymru and the Scottish National Party (SNP) Harold Wilson's Labour Government set up the Royal Commission on the Constitution (the Kilbrandon Commission) to investigate the UK's constitutional arrangements in 1969. The 1974–1979 Labour government proposed a Welsh Assembly in parallel to its proposals for Scotland. These were rejected by voters in the 1979 referendum: 956,330 votes against, 243,048 for.