Error(s) in re-building vignettes:
  ...
--- re-building ‘blog.Rmd’ using rmarkdown
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.
--- finished re-building ‘blog.Rmd’

--- re-building ‘stats19-training-setup.Rmd’ using rmarkdown
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.
--- finished re-building ‘stats19-training-setup.Rmd’

--- re-building ‘stats19-training.Rmd’ using rmarkdown
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.

Attaching package: 'lubridate'

The following objects are masked from 'package:base':

    date, intersect, setdiff, union

--- finished re-building ‘stats19-training.Rmd’

--- re-building ‘stats19-vehicles.Rmd’ using rmarkdown
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.
Data provided under OGL v3.0. Cite the source and link to:
www.nationalarchives.gov.uk/doc/open-government-licence/version/3/

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

trying URL 'http://data.dft.gov.uk.s3.amazonaws.com/road-accidents-safety-data/dftRoadSafetyData_Vehicles_2018.csv'
Quitting from lines 28-30 (stats19-vehicles.Rmd) 
Error: processing vignette 'stats19-vehicles.Rmd' failed with diagnostics:
cannot open URL 'http://data.dft.gov.uk.s3.amazonaws.com/road-accidents-safety-data/dftRoadSafetyData_Vehicles_2018.csv'
--- failed re-building ‘stats19-vehicles.Rmd’

--- re-building ‘stats19.Rmd’ using rmarkdown
Pandoc is required to build R Markdown vignettes but not available. Please make sure it is installed.
trying URL 'http://data.dft.gov.uk.s3.amazonaws.com/road-accidents-safety-data/dftRoadSafetyData_Accidents_2017.zip'
Quitting from lines 84-85 (stats19.Rmd) 
Error: processing vignette 'stats19.Rmd' failed with diagnostics:
cannot open URL 'http://data.dft.gov.uk.s3.amazonaws.com/road-accidents-safety-data/dftRoadSafetyData_Accidents_2017.zip'
--- failed re-building ‘stats19.Rmd’

SUMMARY: processing the following files failed:
  ‘stats19-vehicles.Rmd’ ‘stats19.Rmd’

Error: Vignette re-building failed.
Execution halted