Zinc did the breaky garage as Zinc.
Twisted Individual did some breakstep type stuff as Bogeyman i think - Smelly is great.
There's way more than this.
Steve Gurley, who pre-empted dubstep by years and still is hard to beat, was in Foul Play. T Power did breaks. Shy FX and T Power made a Latin 2step white label as Mystery Men, did a d&b remix that blew up and took on the charts with "Shake UR Body", pretending the garage bit never happened. Potential Bad Boy made jungle, went to garage as Chris Mac then returned to d&b. Brockie & Ed Solo made breakbeat garage on bingo. Hype made breakbeat garage too. Think about hardcore's Top Buzz, who included the Dreem Teem's Mikee B and Social Circle's Jason Kaye.
Then there's the garage/grime artists who never made it big in jungle so headed off when things got "locked down", like Terror Danjah and Teebone (who bailed out of proto-grime at around 2001/2, just as he was ahead of his time).
The new school equivalent of "UK garage" is now funky 'house, and
ooh look if it isn't various threads of the 'nuum re-combining in the form of grime pioneer Geeneus and d&b's Zinc collaborating (or so the myspace seems to allude to), on a funky house track Jelly Jams ft. Nikki "Emotions".
This interbreeding isn't that surprising, since jungle and UK garage were essentially the same demographic of London - multi genres, one community - which is why Simon Reynold's hardcore continuum theory holds so much water.
It's also highlights the tragedy of new school drum & bass. Because no matter how many amazing photek-esque beats get produced by blokes from Finland or whatever, d&b has abandoned it's founding audience: young urban multicultural London. Zhao called it a "zombie genre" which hits the nail on the head.