The various options that are available to the visitors for Museum Visits are as follows:
Victoria and Albert Museum at Cromwell Road, Knightsbridge, London
By Tube: You can take a tube from the Heathrow Terminals which will take you to South Kensington Underground. It takes nearly 38 minutes to reach South Kensington.
By Taxi: You can even select a taxi which will take you directly to the museum from the airport. The estimated time taken by taxi is nearly 25 minutes.
British Museum at Great Russell St., Bloomsbury, London
By Tube: You can ride a tube from the Heathrow Terminals Underground Station which will take you to Russell Square Underground. The time taken to reach Russell Square Underground is nearly an hour. From here British Museum is nearly 10 minutes by foot.
By Bus: You can even board a bus from the Heathrow Central Bus Station. Bus N9 will take you to Charing Cross, Trafalgar. From here you can reach your destination by foot if you cover a distance of 1.5 kilometers.
Science Museum at Exhibition Road, Kensington, London
By Tube: You can reach South Kensington Underground from the Heathrow Terminals Underground Station by taking a tube. It takes approximately 38 minutes to reach South Kensington. From here you can reach Science Museum by covering a distance of 730 meters by foot.
National Gallery at Trafalgar Square, London
By Tube: From the Heathrow Terminals Underground Station, tubes are available which will take you to Leicester Square underground. From here National Gallery is 5 minutes by foot.
By Bus: You can board the bus N9 from Heathrow Central Bus Station which will take you to Charing Cross. From here it takes only 2 minutes by foot to reach National Gallery.