Nicolas Jackson got Chelsea off to a fine start in their London derby against West Ham United earlier. It took Nicolas Jackson just four minutes to put Chelsea in front, with the striker calmly slotting past Alphonse Areola. It was Jackson’s third goal in the Premier League this season before he grabbed his fourth not too shortly afterwards. And with that brace, the 23-year-old managed to surpass one former Chelsea forward’s top-flight record. Before the game, John Obi Mikel wanted to see Jackson improve his finishing. READ MORE: Nicolas Jackson admits he doesn’t do one thing enough for Chelse…