I'm collecting a fair few cylinders now - 9 at the last count. No, 10 with the suit inflate. These need testing on a regular basis. I've used my Local Dive Shops who send them off, adding their margin. But now it's getting expensive. I need to get a twinset and two stages hydro tested + O2 cleaned which would be ~£220 at my LDS + fills. NDACs prices seem better - £35 compared with £50 at the LDS. What's their turnaround times? Recommendations on the South East / South coast?