Robuta

https://www.gogonu.com/categories/129/british
British videos feature performers with accents from London or Manchester, often in pub-like rooms. GogoNuCom has feeds of these UK-themed adult clips.
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https://www.lingq.com/en/learn-english-online/courses/854680/understanding-british-accents-1-17152744/
Learn English from English LingQ 2.0 Podcast using the LingQ language learning system to learn from content of interest.
british accentsenglishlingqpodcastunderstanding
https://www.wimp.com/accents-of-the-british-isles-and-their-geographic-location/
Dialect coach Andrew Jack provides a tour of the accents found in the British Isles, and highlights the key differences between each region's pronunciation of...
british islesgeographic locationaccents
https://aclanthology.org/2020.lrec-1.804/
Isin Demirsahin, Oddur Kjartansson, Alexander Gutkin, Clara Rivera. Proceedings of the Twelfth Language Resources and Evaluation Conference. 2020.
open sourceenglish accentsmultispeakercorpora