The BBC's attempts to shoehorn minority ethnic actors into period pieces is ridiculous.
But sometimes it reveals an ignorance on the viewers part ?
Any mid Roman-era drama (for example) should have lots of African faces ... generally Romans were colour blind.
Also, people from the middle east weren't unknown in Tudor times. Pretty high status, traders and diplomats.
And quite a few people are surprised to learn that the first non-white MP was elected in 1892.
Just out of curiosity, can anyone categorically confirm there was no colonel who may have matched that description in the British Army in 1925 ? Or is it a presumption ?
(All of that said, it's rather pointless questioning the historical accuracy of one part of PB. This last series has been more of a fairy tale)