The Daily Mail has its own Turn The Tide On Plastic campaign and sees itself as thriving mayor force against plastic pollution. The Daily Mail Online frequently publishes articles promoting its own campaign’s successes.
An example: https://www.dailymail.co.uk/news/article-7307671/Plastic-bag-use-halves-one-year-supermarkets-record-93-cent-drop-5p-charge.html
The Daily Mail Online is the third most read website in the UK (after BBC News and The Sun Online) and the fifth most used website with the purpose of reading news in the UK in 2018.
Source: https://www.ofcom.org.uk/__data/assets/pdf_file/0024/116529/news-consumption-2018.pdf
Can that still be labelled as advocacy journalism?