Other than the former G-AWHU, which may or may not be extant, I believe the following still survive more or less intact, unless anyone knows otherwise:
ST-AOW (707-336C) at Khartoum, formerly G-AYLT
5X-CAU (707-436) dumped at Entebbe, formerly G-APFL
LV-WXL (707-365C) at Buenos Aires/El Palomar AB, formerly G-ATZD
HL-442CT (707-399C) at Santo Domingo, formerly G-AVTW