Personally I felt that it was safer starting at Port Glasgow. It means that you do not have to cross over onto the fast lane to turn at the newarc roundabout.
The Newarc roundabout is fine if you hit it lucky and there is no traffic behind you, however if you're unlucky the cars approach probably doing over 70mph and even after breaking areentering the roundabout, I'd guess at roundabout 40mph. at those speeds and a setting sun in the drivers eyes, you'd have no chance. (it was frightening watching the cars approach it whilst timekeeping)
The Bishopton roundabout turn isn't perfect, but if you go down the sliproad on the inside, keeping this position till the roundabout, you will have a decent view (not perfect, I admit) of oncoming trafic and at worse have the option to keep to the outside of the roundabout and break if there is a car. Also the cars are travelling much slower giving both the driver and the cyclist half a chance.
It was good at the club champs having Campbell at the turn, maybe if numbers permitted we could have a marshal?