Problems spotted :

1. "Iris tests may be run with python setup.py test " -- is this still true, or is there a bette way ?
2. "There is a python module for checking pep8 compliance: python-pep8" -- should now be referring to flake8
3. "the files ./conda-requirements.yml and ./minimal-conda-requirements.yml are used to define the software environments" -- now uses combined requirements process in iris/requirements
4. "test-images-scitools is a github project containing reference plot images" -- has moved
5. "see Graphics tests" -- docs-page still incomplete https://scitools.org.uk/iris/docs/latest/developers_guide/tests.html#graphics-tests