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Forestry Statistics 2014 - Sources

Sources: Timber

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Private Sector Softwood Removals Survey

Introduction

The Private Sector Softwood Removals Survey is an annual survey conducted by the Forestry Commission (in association with the Forest Service) of a sample of harvesting companies in the UK.

The survey, which previously covered harvesting companies in Great Britain only, was extended in 2004 to include harvesting companies in Northern Ireland. Figures for Northern Ireland in earlier years have therefore been estimated, based on responses to the 2004 survey.

Figures are published as UK totals and by country (England, Wales, Scotland, Northern Ireland).

Data collected

The questionnaire used for the Private Sector Softwood Removals Survey (available at www.forestry.gov.uk/forestry/infd-94ujw2) is issued annually to around 30-40 harvesting companies, to collect information on:

  • the quantity of softwood roundwood harvested from private sector woodlands in the UK in the current (latest) year and in the previous year;
  • the quantity of softwood roundwood harvested from certified private sector woodlands and
  • (from the 2008 survey) the quantity sold to bioenergy (including wood pellet manufacture).

Response rates

In 2013, the questionnaire was issued to 40 harvesting companies, of which 28 responded, giving a response rate of 70%. These respondents are estimated to account for around 96% of all the softwood harvested by companies covered by the survey.

Private Sector Softwood Removals Survey Response Rates, 2004-2013

Year

Forms issuedResponses receivedResponse rate1Weighted response rate2 

2004

41

33

80%

..

2005

40

28

70%

..

2006

43

35

81%

..

2007

43

34

79%

..

2008

41

35

85%

100%

2009 

40

30

75%

92%

2010

40

30

75%

97%

2011 

37

26

70%

96%

2012

37

27

73%

95%

2013

40

28

70%

 96%


Notes:

1. Response rates are calculated as the number of responses received divided by the number of forms issued.

2. Weighted response rates have been calculated from the 2008 survey onwards. They are an estimate of the proportion of the softwood harvested by companies covered by the survey that is accounted for by respondents.

.. Denotes data not available.

 

Methodology

A review of the methodology used to estimate total private sector softwood removals (including businesses not covered by the survey) was undertaken in 2011-2012.

The "Methodology Review of Softwood Removals from Non-FC/FS Woodland" paper presents the results from this review and the implications of the change in methodology. It can be found at www.forestry.gov.uk/pdf/rem_methodology_rev2011-12.pdf/$FILE/rem_methodology_rev2011-12.pdf

In the new methodology, businesses not covered by the survey are assumed to represent 15% of the total softwood removals from private sector woodland. This fixed percentage is applied from 2006 onwards. The previous methodology is used for 2001 and earlier years, and a smooth transition is applied to the years 2002 to 2005 inclusive. 

Quality

Detailed information on the survey quality is available in the "Quality Report: Private Sector Softwood Removals Survey" at www.forestry.gov.uk/pdf/qrremovsur.pdf/$FILE/qrremovsur.pdf

Further quality information on FC Official Statistics is available at: www.forestry.gov.uk/forestry/infd-7zhk85

Revisions

Results from the Private Sector Softwood Removals Survey may be revised between the provisional figures published in the First Release "UK Wood Production and Trade: provisional figures" and the final data published in "Forestry Facts & Figures" and "Forestry Statistics", to take account of late returns and the results of additional data quality checking procedures.

In order to use the most accurate information possible in estimating total private sector softwood removals, figures for non respondents in earlier years are estimated wherever possible, using their responses in previous and in subsequent years. This may cause the estimates for all previous years to be revised when new data are received from a former non-respondent. This process reduces the potential over-inflation of estimated removals which can be caused by harvesting companies tending to respond when removals have increased but being less likely to do so when their removals have reduced.

Figures for 2013 are final; provisional figures were previously released in "UK Wood Production and Trade: 2013 provisional figures".

Figures for 2013 and earlier years have not been revised from those in "UK Wood Production and Trade: 2013 provisional figures".

Some figures for 2010, 2011 and 2012 have been revised from those published in "Forestry Statistics 2013":

  • In Table 2.28, the percentage of total softwood removals volume that is certified has been revised from 86% to 87% in 2010, 86% to 85% in 2011 and 85% to 84% in 2012.
  • In Table 2.30, the woodfuel supplied by sawmills to bioenergy in 2012 has been revised from 545 to 540 thousand green tonnes.

Information on other revisions made since "Forestry Statistics 2013" are provided in "UK Wood Production and Trade: 2013 provisional figures".

Release schedule

Provisional figures for 2014 will be released on 14 May 2015 in "UK Wood Production and Trade: 2014 provisional figures".

Final figures for 2014 will be released on 24 September 2015 in "Forestry Statistics 2015" and "Forestry Facts & Figures 2015".

Links to Forestry Statistics 2014