Sorry, no personal recommendations but do check

the 'Scotland' pin on
UK Folk Links
https://ukfolklinks.wordpress.com

The 'Folk CLUB Map'
https://folkclubmapuk.wordpress.com

Chris Rust's 'Folk MUSIC Map'
https://folkmusicmap.wordpress.com

'TheSession'
- primarily instrumental sessions
https://thesession.org/sessions

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After you've neen it'd be interesting to know how the suggestions from mudcat compare to what google\AI throws up these days. ;)