Here's a link to Charles Heyer's grave in Nairobi. Died Oct 1931, about the time Karen Blixen left Kenya. I'm sure Karen, Bror, Denys Finch-Hatton and the Happy Valley set were in the store more than once.

http://www.eamemorials.co.uk/EAMemorials/KENYA/Nairobi%20Forest%20Road/Forest1437.htm