A tricky, but potentially rewarding fishery, get the East Mills Flume sight on your phone for reference, above 1.18mtrs(was 1.2mtrs), spinning is allowed from February 1st, otherwise its fly only until May 15th, then prawn/shrimp from June 16th, temperature at Knapp mill allowing(19c cut off).
Be prepared to use the most appropriate method allowed, on any given day! If you want to just fly fish, good luck, but you will limit your chances!
Fish run through both weirs, the section above the first weir looks uninviting, but holds fish, not fly water, better suited to spinning/bait fishing, lots of pools, lots of water, good luck.