Well, the
history of
Britain is indeed one of repeated invasions, for example by the people for whom
England (Angle-land) is named. In that, we are hardly unique.
The
Romans are among the few invaders who didn't stay. So as far as the series premise is concerned, the programme said, in essence: some Africans came to
Britain and then went away again.
As for the Trafalgar programme, the presence of foreigners and freed slaves in the British navy is hardly news either, especially to anyone who has read Patrick O'Brian's books or knows a
bit of
history.
So the series is mostly aimed at people who haven't read much and don't know much. But there were some interesting things in them, for example Nelson's battle strategy, which is not often explained.
Bill