1. Introduction
2. Data
2.3. New computation of cross-correlation functions
2.4. Radial velocities and their uncertainties
3. Searching for SB1s
3.1. Data-cleaning filters
3.2. Statistical χ²-test
3.3. F2 statistics
3.4. Comparison between GES and NACRE RVs
4. Results and Discussion
4.1. Radial velocity variables from the χ² test
4.2. Gaia-ESO Survey benchmark stars and RV standards
4.3. False positives
4.4. Properties of SB1 candidates
4.5. Comparison with other surveys
5. Summary