Sydney is the sole author of the leading loose-leaf services Commercial Damages and Injunctions: Law and Practice both published by Thomsons Reuters and is one of the main contributing authors to another Thomsons loose-leaf service, International Commercial Arbitration. As such, Sydney has built up a significant level of knowledge in these areas.

Damages issues also arise in many of his cases. For example, in one of his cases currently on foot in the Equity Division, there is an issue of whether mesne profits are recoverable and if so, on what basis. Further, in his easement matter Turvey v Crotti, Sydney took the point that aggravated damages were recoverable in nuisance for interference with a right of carriageway.

Sydney has also been involved in numerous injunction applications.