Transit Passengers do not need a UK visa. However, when one steps out to change Airports, one need a visa. Green Card Holders may be able to obtain a visa upon arrival in UK.
Good Luck and let us know as to the requirements first-hand.
I travelled and changed airports to get connecting flights and used the shuttle to go from heathrow to gatwick did not need any transit visa as you have ticket for the connecting flight and your baggage is already checked in
just my experience - no one even asked anything at airport
I travelled late last year. While coming back from Bombay to Phoenix I had to go from Heathrow to Gatwick. I got a 24 hour transit visa on spot at Heathrow. Their bus takes you to Gatwick. It is a 30 min drive.
Have a safe journey...
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