When we flew London - Sydney via Bangkok, we were advised by the Captain that we could get off, but as we would be on the ground for 1 1/2 hrs and apparently the lines for security were horrendous, he advised against it. So we stayed on the plane had a look in first class (escorted by one of our stewards)...would have been nice if we had the money!, and watched the service staff come on and get the plane ready for the next leg. That was quite interesting in itself.