People are being urged to stay away from Chesham Street with traffic building as firefighters quell the flames. East Sussex Fire and Rescue Service received report of the fire at around 11:54am, Monday August 3. West Sussex Fire and Rescue Service are also providing support. Engulfed top floor (Image: Sussex News &Pictures)An aerial ladder is being used to help extinguish the blaze. Smoke can be seen rising above the Brighton and Hove skyline.