P clips here http://www.zeroclips.com/p_clips.htm
I bought stainless ones of these a couple of years ago.
Saddles clamps
http://www.nero.co.uk/tube_pipe_clamps_bolts~_saddle_pipe_clip_
You will need to cut some strips of rubber for the saddle clamps to protect the powder coating on the roofrack.
Adrian
BT08BTX (Beatrice)
Atlantic Rising 110
Stupid question but......where can I get some metal saddle clamps to secure my roof rack floor - I want to replace the p clamps,,,,,,, Alan