Slightly off topic perhaps, but I have a reference to 95 Sqn RAF flying Sunderlands based at Bathurst, Gambia between 1943-45 being involved in tracking a U-boat returning from the Far East in March 1945. During the same search there is a reference to a Sunderland of 204 Sqn based at Jui, Freetown on secondment to Bathurst.
No confirmed contact with the U-boat was recorded, though it later transpired that the boat was U-532.