Is it OK to ask a London Tube question here? If so, the map would seem to show numerous options for getting from Mudchute on the DLR line to Heathrow, but we are making this trip on a Sunday morning with wheeled luggage, so minimizing long walks and stairs would obviously be helpful. I came up with these two, but I'm sure the advisors here may have better ideas: 1) Mudchute-Canary Wharf on the DLR, Canary Wharf-Green Park on the Jubilee, Green Park-Heathrow on Piccadilly. 2) Mudchute to Bank on the DLR, walk to Monument, Monument to Paddington on the Circle Line, and Paddington to Heathrow on Heathrow Express or Connect. Thank you.