GUEST,a, you might be right, in which case I stand corrected. But I've not managed to find anything to update the info provided HERE, for instance, where a UK government minister was talking about marshals being deployed on "some" flights. A BBC report refers to the UK acting in line with Australia and the article for which I've given the link said Australia was deploying 70 marshals on internal flights and 40 on international flights.

In other words a derisory proportion of flights. (Though I assume the FAA has stipulated that there must be marshalls on all flights into and out of the US.) As I said, I might have fallen behind the times on this, but I haven't managed to find much info on the present situation.