It's in the Guineas Shopping Centre, which is more or less in the High St.
Cambridge has a Homebase and an Argos close to Wickes, B&Q, and Jewson, and a smaller Argos nearer the town centre. And Travis Perkins and Ridgeons elsewhere, and Screwfix and Toolstation elsewhere again. Wickes didn't have a Toolstation last time I was in it - it would be more convenient for me than the standalone one if it did.