cheers Guys 
Originally I tried some standard wall plugs and screws but barely held a 5kg weight without pulling out a little so pulled them back off the wall (by hand
) and re did them with some breeze block screws from B&Q and now they comfortably hold me hanging from them at about 90kg.
The tubing is all 16swg and in the pic is 6m of 2" and 4m of 2.5"
The bit about not using a gasket is about the V-band flanges. As it is a flush joint with a clamp wrapped around it there is no flanges required (or even available as far as I'm aware) make for a much more reliable joint as, of course, there is no gasket to blow out.
As a plus they make for swifter changes too if you happen to be like me and like to swap things around a lot.

What are you using to fix them to the breeze block ? Do you know how much weight it will hold ?
PS: what was the gauge of the tubing for the exhausts? Looks good. I may have a go at that myself, next time i do an exhaust. Also what is this you mention about not using gaskets ?
Originally I tried some standard wall plugs and screws but barely held a 5kg weight without pulling out a little so pulled them back off the wall (by hand

The tubing is all 16swg and in the pic is 6m of 2" and 4m of 2.5"
The bit about not using a gasket is about the V-band flanges. As it is a flush joint with a clamp wrapped around it there is no flanges required (or even available as far as I'm aware) make for a much more reliable joint as, of course, there is no gasket to blow out.
As a plus they make for swifter changes too if you happen to be like me and like to swap things around a lot.