My bad, if you have high enough marks you may qualify for B Eng (Hon) on your testamur. According to the UNSW Handbook:
"Honours
(a) BE with Honours
On completion of the requirements for the combined degrees a student may qualify for the award of the BE degree with Honours in accordance with the rules for the BE program of specialisation and the Faculty of Engineering rules for calculation of the grade of Honours (Honours Class 1: a weighted average of 75% or greater; Honours Class 2 Division i: a weighted average of 70% or greater; Honours Class 2 Division ii: a weighted average of 65% or greater, and a student being awarded the highest grade of Honours for which they qualify).
(b) BSc with Honours
On completion of requirements for both components of the combined degree a student may be qualified to enrol in an Honours program in the Bachelor of Science and to qualify for the award of the BSc with Honours after successfully completing an additional year of study (48 UoC) as specified in the rules of the Faculty of Science."
Source:
http://www.handbook.unsw.edu.au/undergraduate/programs/2008/3042.html#honours
And just for the record I'm a B Eng/B Sci student, Musk.