http://www.caitlingreen.org/2016/05/a-note-on-evidence-for-african-migrants.html
Interesting, thanks. Also intriguing is the post on the same blog about early Arabic evidence for the Heptarchy, and for Britain being considered in some sense "Byzantine" - http://www.caitlingreen.org/2016/04/heptarchy-harun-ibn-yahya.html
yes, saw that Duncan, its actually quite a good blog with many interesting topics - she's published too