CG, Shell..... the route i tried, did have a fairly steep hill, too, but it went up and flattened out, then up then flat etc, so not as bad as Sutton which is constant climbing with a hairpin ( we came down that way too shell) lol
Although I was on pilly and not riding Ziggy, I'm sure its not too bad, been told to just keep it in 2nd all the way up. I'm sure we will be fine.