| Regimental number | 610 |
| Place of birth | Port Fairy, Victoria |
| School | Ballarat East Orphanage, Victoria |
| Religion | Church of England |
| Occupation | Labourer |
| Address | Colac |
| Marital status | Single |
| Age at embarkation | 24 |
| Next of kin | Brother, A R W Brett, 52 Perth Street, Prahran, Victoria |
| Previous military service | Nil |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 8th Light Horse Regiment, C Squadron |
| AWM Embarkation Roll number | 10/13/1 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board Transport A16 Star of Victoria on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 8th Light Horse Regiment |
| Other details from Roll of Honour Circular | Name given on RoH circular as Leslie Neville Wilfred BRETT.Died at 1st Australian General Hospital, Heliopolis, Egypt. |
| Fate | Died of disease |
| Place of death or wounding | Gallipoli, Turkey |
| Age at death | 24 |
| Age at death from cemetery records | 24 |
| Place of burial | Cairo War Memorial Cemetery (Row B, Grave No. 256), Egypt |
| Panel number, Roll of Honour, Australian War Memorial | 6 |
| Miscellaneous information from cemetery records | Parents: Ernest and Blanche BRETT. Born at Port Fairy, Victoria |
| Other details |
War service: Egypt, Gallipoli Medals: 1914-15 Star, British War Medal, Victory Medal |