Another difference is that in the UK there isn't nearly as much of a history of recent oppression of the decedents of the anglo-saxons the way there is a very recent and on going issue of oppression of the indigenous Americans and Australians. So there isn't the issue of the excavations being yet another example of an empowered people overriding the wishes of a dis-empowered people.
To put it another way, a large majority of the indigenous people of the Americas have expressed a wish that their ancestors not be excavated. And that wish has been ignored time and time again until recently (though it frequently still is ignored).
Here, no clear majority of the descendants have expressed such a wish, there's no history of it being overridden or ignored, and the excavators (for the most part) are descendants.
Incidentally a group known as the "diggers" did seek some redress from their successors.
In any event, bones are bones. I feel that after certain cut-off point, they become historical and are fair game for archeology. It's another story if it's an active or tended to graveyard --but if it's not known and is forgotten, then I think it's a fair archeological site.