Create a clean and minimalist digital illustration of London’s iconic red double-decker bus, rendered with sleek, precise lines and sharp edges. The entire design should utilize a monochromatic palette in varying shades of red, creating a bold and unified look that emphasizes the bus as the sole focus. The negative space around the bus must be entirely transparent, making it perfect for printing on a shopping bag without visual clutter. Position large, bold text in a sans-serif font reading "LONDON" vertically to the left of the bus, ensuring it subtly blends into the design without overpowering it. The transparent background will ensure versatility, while the striking simplicity of the illustration draws attention to this timeless symbol of London.