Sink clips or not

me too, there was a time when the firm i worked for, i think it was in the 1980's , had us pressure testing every length of new pipe before installation, Most plumbers, including me, said, fuck that we'll never make any money, They were buying the cheapest copper pipe and we had to use it, lots of it snapped when bending ,
I moved to another firm and they insisted on Yorkshire tube, end of problem,