MRK1 has been involved in dubstep since the very early days. He is the producer and DJ behind dubstep/grime act Virus Syndicate who have had tracks like this featured on Channel4s Skins. The voice featured in this is David Mitchell from Peep Show btw!
Well MRK1 has just recorded a filthy 40minute mix for Dontstayin.com which you can find here. Enjoy.