This is an interesting article that might be of interest to some looking into professional practice that looks at teaching and mention s some datasets that could be used by others discusses these issues.
The article by Sarah Marsh and mentions surveys by the Association of Teachers and Lecturers (ATL) - "The ATL conducts a self-selecting annual survey, which doesn’t record information about the spread of respondents across the UK." AND "The Department for Education (DfE) does a weighted survey annually of maintained primary, secondary, special and academy schools in England. The sample sizes for both pieces of research are fairly robust, though, at around 1,000 respondents each."
Here is the link: