Dizzee doesnt even do grime anymore, he sold out like Lady Sovereign did. Listen to his older stuff when he was doing garage with Wiley.

As for rap artists.....

Sway
Klashnekoff
Kano ( like Dizzee, was in the grime scene but sold out and became more commercial, still good )
Roots Manuva
Blak Twang
Task Force
Foreign Beggars
The Streets ( not hip hop but still good )
Jehst

The best artists in the UK are the ones that stay underground and dont show their faces much