Is it alright for British BAME actors to act ethnic?

So I get it “blacking up” is offensive although it’s taking things too far when white people cannot voice black cartoon characters .

Where do we stand on British BAME actors putting on foreign accents?

Two examples, Sanjeev Kohli in Still Game. Sanjeev plays Navid an Indian shop keeper (let the stereotyping go for now), complete with heavy Indian accent. His normal voice has a Glaswegian accent. I’d this OK?Second example , Lorna Laidlaw playing Mrs Tembe from Botswana in Doctors. From the way she eebagums it in Corrie, I don’t think that’s her real accent?