I don't know anything about this site other than it's UK. Maybe they can help.

I'm not sure what you mean by "what about the swamp part?". There is swamp-rock and swamp-blues, which are Louisiana versions of rock/pop and blues, respectively. Swamp-rock would be rock with country & Cajun music influences (CCR and Tony Joe White are often cited as examples, as is Lynyrd Skynyrd. My friend calls this the Seventies Southern Rock Anthem phenomenon). Swamp-blues is another subtype of blues, as opposed to Delta blues or Piedmont blues.

Here, this is kind of interesting.