Ok, minor update, 200 Cup toe settings are slightly different to the 197/197 Cup toe settings but only by 2 minutes, with significant cross over in spec, so there would be no benefit in having the toe settings adjusted again in advance of the track day tomorrow.
Initial impressions suggest that the car is understeering more, which had I researched getting a thicker ARB I would have realised was a common result. Unfortunatley it was all a bit of a rush to get the car into the garage to get the manifold done and the ARB was very much spur of the moment because we were dropping the subframe anyway so it made sense to do it at the same time.
There are ways to counteract the understeer, such as adjusting toe out, increasing track, etc. but I don't really want to go down that road. Current view is see how it is tomorrow and then consider refitting the standard ARB.