I used the Mass-Observation archives extensively in my PhD research (see www.ww2poster.co.uk), as it has lots of really interesting material from observations (both direct and indirect) plus collated materials from the war years (and since). It was really ahead of its time! Much of the best material is only available by visiting the archives (based at the University of Sussex), but some of their published material is shortly to be published by Faber & Faber in modern editions.
“They offer an extraordinarily vivid glimpse of a time which will soon not be accessible to living memory. Not only that, they provide evidence of how astutely Mass Observation pre-figured many later intellectual and methodological developments in social research especially in oral history and life history research, in feminist and working class history and in the kind of social research which privileges what we sometimes call the ‘ordinary person’ and the importance of studying everyday life” Professor Dorothy Sheridan, Mass Observation Archive.
I would particularly recommend these wartime finds:
Dr Bex Lewis is passionate about helping people engage with the digital world in a positive way, where she has more than 20 years’ experience. She is Senior Lecturer in Digital Marketing at Manchester Metropolitan University and Visiting Research Fellow at St John’s College, Durham University, with a particular interest in digital culture, persuasion and attitudinal change, especially how this affects the third sector, including faith organisations, and, after her breast cancer diagnosis in 2017, has started to research social media and cancer. Trained as a mass communications historian, she has written the original history of the poster Keep Calm and Carry On: The Truth Behind the Poster (Imperial War Museum, 2017), drawing upon her PhD research. She is Director of social media consultancy Digital Fingerprint, and author of Raising Children in a Digital Age: Enjoying the Best, Avoiding the Worst (Lion Hudson, 2014) as well as a number of book chapters, and regularly judges digital awards. She has a strong media presence, with her expertise featured in a wide range of publications and programmes, including national, international and specialist TV, radio and press, and can be found all over social media, typically as @drbexl.