cover 1899-1902 group with 1899 envelope from Tonbridge to Transvaal bearing boxed "MAIL SERVICE SUSPENDED", 1900 covers (2) from Transvaal to Cape Town with "STOPPED BY CENSOR/RETURN TO SENDER" and 1902 envelope from Durban bearing "NO POSTAL COMMUNICATION"; each with Returned Letter Office Natal c.d.s.; one with defects