London's Underground scene is loud, sweaty, and filled with some of the best music you've never heard of. Those nights dancing with the bands after their sets to the rest of the line up are what London's underground scene is all about. Most the gigs are free and even the paid ones have amazingly intimate venues. The music is too good to go unknown, so check out some of the bands I've seen recently. Videos/links below.
If you like Reggae... No Promises by In Search Of.
Maybe "Mutant Science Punk Rock?" Then Scotland's awkwardly amazing We Are The Physics. Applied Robotics video above.