If you’re near Tottenham Court Road, the Elizabeth line provides a direct, modern train to Heathrow

https://donovanabig972.image-perth.org/bus-routes-to-heathrow-airport-local-services-night-buses-and-fares

If you’re near Tottenham Court Road, the Elizabeth line provides a direct, modern train to Heathrow, often faster than the Piccadilly line.