I'm trying to do an accent detection project.
Do you want specific accentwise data or recording of people chatting in a normal scenario would do as well?
Here are some resources, hope you find them to be heplful,
Apart from this, you could use youtube videos and transcripts, or speeches in different accents and their transcripts, sports commentary would be a good source as well.
Another good source is vlogs, they are natural and varied when it comes to accent.