The signing of Nicolas Jackson is proving a better piece of business for Chelsea this season with every passing game. The Senegal international was at the double in yesterday’s comprehensive victory against London rivals West Ham, winning 5-0 at Stamford Bridge. Jackson set up the opener for Cole Palmer in the early stages, before the Blues ran riot and put the game beyond doubt in the first half. READ MORE: ‘My little brother’… Demba Ba amazed by £32m Chelsea player after watching him against West HamThe 22-year-old added to the first half lead with a brace in the second half, converting the …