These two have been at each other over the chrismass/new year period. Two of the best MCs in the UK are making tracks for each other taking the piss.
It started when Wiley & Trim rubbed shoulders on Rinse FM last Sunday and they got a paranoid thinking they had lyrics for each other. You can hear that here at around 1h30m onwards: http://www.mediafire.com/?vnzzdhmymz3
Then the tracks keep coming replying to each other and upping the hype each time...
Wiley - Now Heard Dis
Trim - Dat 1
Wiley - Last Freestyle Of 09
Trim - 1st Freestyle Of 2010
It looks like the clash is on, Big H has been called for too by Wiley but no tracks have been made yet... H started it all mind with lots of vids on youtube dissing Roll Deep and Wiley. So we'll see if he enters the war after all that talk.
Bonus: Dot Rotten - Woah Ouh Woah (Xmas War Dub)
Dot got sick of people indirectly abusing him all year and sent for them all on one sick track at chrismass.