Macclesfield is a constituency represented in the House of Commons of the UK Parliament since 2010 by David Rutley, a Conservative.
North Wiltshire is a constituency represented in the House of Commons of the UK Parliament since 1997 by James Gray, a Conservative.
 In the period 1832–1983, this was an alternative name for Chippenham or the Northern Division of Wiltshire and as Chippenham dates to the original countrywide Parliament, the Model Parliament, this period is covered in more detail in that article.
 In 2016 it was announced that the North Wiltshire constituency would be scrapped as part of the planned 2018 Constituency Reforms.
Dartford is a constituency represented in the House of Commons of the UK Parliament since 2010 by Gareth Johnson of the Conservative Party.
 The constituency is currently the longest-valid 'bellwether' constituency in the country as the party of the winning candidate has gone on to form the government in every General Election since 1964.
 Candidates for the largest two parties nationally have polled first and second since 1923 in Dartford.
Nuneaton is a constituency represented in the House of Commons of the UK Parliament since 2010 by Marcus Jones, a Conservative.
 Since 1997, the seat has been seen as an important national bellwether.
Hastings and Rye is a constituency represented in the House of Commons of the UK Parliament since 2010 by Amber Rudd, a Conservative.
 Rudd has been Home Secretary in the Theresa May Cabinet since 2016.
West Suffolk is a constituency represented in the House of Commons of the UK Parliament since 2010 by Matthew Hancock, a Conservative.
 Between 1832 and 1885 there had also been a constituency, the Western Division of Suffolk that had also been called West Suffolk.
Pendle is a constituency represented in the House of Commons of the UK Parliament since 2010 by Andrew Stephenson, a Conservative.
 The constituency was newly created for the 1983 General Election, being largely formed from the former Nelson and Colne Constituency.
South Dorset is a constituency represented in the House of Commons of the UK Parliament since 2010 by Richard Drax, a Conservative.
 The constituency was created as a consequence of the Redistribution of Seats Act 1885, although the area covered has changed since then.
The Macclesfield by-election, 1971 was a parliamentary by-election held on 30 September 1971 for the constituency of Macclesfield in Cheshire.
 It was caused by the elevation to the peerage of the sitting MP, the Conservative Arthur Vere Harvey.
East Surrey is a constituency represented in the House of Commons of the UK Parliament since 2010 by Sam Gyimah of the Conservative Party.
 Its record is that of a Conservative safe seat based on time and opposition.
 It has elected a Conservative Party MP on an absolute majority since the seat's establishment, in 1918, and it's greatest share of the vote for any opposition candidate was 33.75% in February 1974.

Question: When was the by-election of a constituency represented in the House of Commons of the UK Parliament since 2010 by David Rutley held on?
Answer: 30 September 1971