War graves from overseas forces buried in Chester Crematorium and Cemetery, Cheshire

I wonder how these foreign soldiers came to be buried in Chester.

H.C.T. refers to the High Commission Territories of Basutoland (Lesotho), Bechuanaland (Botswana) and Swaziland.  These countries wanted their forces to be separate from their South African counterparts and following discussions with the High Commissioner in Pretoria the African (Auxiliary) Pioneer Corps was established.  The word "Auxiliary" was later dropped.