There is a rich history of everyone looting graves. This isn't a colonial vs other thing here. Sacking of places is common and still happens (see syria, afganistan & the sudans. ) We just happen to know about the stuff the western people did because they documented it and put it on display. (unlike the romans, persians, greeks, byzantines, ottermans, et al. didn't loose it to the next empire, yet.)

There used to be a bunch of TV shows where they'd routinely dig up bones and put them on shelves in storage.

Applying to exhume a body isn't that difficult in the UK either: https://www.gov.uk/apply-for-an-exhumation-licence