^ Yes i too miss the heyday of Dizzee Rascal; his first album is lyrically great. Unfortunately he's gone the way of making music for mainstream now; i mean, nothing wrong with that it's just sad that he's lowered himself to it. Don't get me wrong i still listen to his shit sometimes, it's just..agh, i dunno, you miss the real shit. I feel like this with Chipmunk too; Who Are You and 50 Bar Statement were great (although 50BS had a line that'd come back to haunt him..) but now his songs irritate me, with their lazy lyrics, repetitive concepts of "love" and chopped and pasted female choruses.
I also agree on JME; even though the UK's rappers often are very repetitive and similiar (and that's a fact), JME has brilliant lyrics and he's the only member out of Boy Better Know that i actually know well and think is decent, along with debatably Skepta. Can't say i'm a huge fan of BBK themselves, just too predictable to be honest.
Wiley and Kano are also great, though Kano seems to be going slightly the auto-tune route lately.
Problem with naming favourite rappers out of my country is that lately my country's rappers have quite often become one big amalgamation; they're incredibly similiar. The ones i mentioned above are the few standouts in my eyes. The grime style has soaked into the UK consciousness so deeply that i don't think i've really heard a mainstream hit UK rap song so far that's not had the following:
Fast flow
Lyrics about either females or repping/being hard/fighting people
Abundance of similies and bragging and little else in verses
There are some that aren't as such, however. Plan B is a promising newcomer to me; his storytelling skills are brilliant, he sings as well so he's got the versality people like Chipmunk haven't (hence why Chippy always recruits random women for his songs) and he doesn't just rap about how hard he is or how many man he can bun.
I like Lady Sovereign a fair amount, which is surprising when you consider that one of my favourites is a woman. But she does have skill. I mean you can't deny that she was talented if she got signed to Jay-Z's label from rapping part-time using things like MySpace and battling on MSN while working in a donut shop. Her first album showed some true talent, even if she did use some kind of fake jamaican accent on half of it; imo i think she was just finding herself stylistically there, experimenting. Those Were The Days captures UK childhood perfectly for me, and Public Warning has some insane riffing on tongue-twisters that prove she can flow and deliver. Her second album i like even more, though it hasn't been as big in the mainstream (probably combined from her tantrums in live performances in which she leaves early, her not being on Jay-Z's label and the general switch in style on this album from before); Student Union is a truly entertaining song about, well, the student union bar, and Guitar is a brilliant insight into her life.
This underground guy
Hyperaptive is also good, although he always gets compared to Eminem for being white; also, he (like me at times) can suffer with being typecast by a dislike for the retarded mainstream music he sees, so he often raps about it. His music's very relevant to the UK though, anyone UK would get what he's talking about in most of them. Make no mistake though his lyrics and beats are great and if you can go in not saying "omg Eminem ripoff" you should find something to like.
I think i've covered most of them, though no doubt somebody will reply with one and i'll remember them. This is just a combination of my favourites (bottom half) and the rappers that are most in the UK scene around this time (top half).