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The main disadvantages of going to the dual-injection system are:  \begin{itemize}  \item Additional work would be required to design and test the UTM beam injector. Relatively simple designs consisting of an LED, pinhole and lens could likely meet the requirements, since the stability requirements are modest. This work could should  be offset against the saving in design work due to the  simpler design possible for BEASST. \item BEASST must be ready when the AAS functionality is needed. Again the simplicity of the revised BEASST design means that this is not likely to cause schedule difficulties.  \end{itemize}