UK garage is in a bit of a slowdown these days, but stuff is still coming out. I'd recommend starting your research at www.dubplate.net. This is run by the folks behind Ammunition management & distro, and all of their artists have a tough, dubby sound, much more underground than the pop/charts stuff like So Solid or Artful Dodger. Artists to look for include Horsepower Productions, Ghost, El-B, Zed Bias, Maddslinky, Darqwan, etc.
Also check www.hyperdub.com for some good articles and mix sets of similar material.
For mix CDs, Locked On has two good ones in the "Sound of the Pirates" series, one mixed by Zed Bias. There are also a couple of good mixes on DJ Zinc's Bingo Beats label, but these are more breakstep.
philip sherburne
managing editor, flavorpill sf
http://www.flavorpill.net
contributing editor, neumu
http://www.neumu.net/needledrops
do you want new wave or do you want the truth?
http://www.audio.bobblehead.org/phil.html