The camera is generally behind the top windscreen:
There are probably a multitude of conditions that need to be just right before adaptive cruise will engage, so if it's not a mucky windscreen and the road is ok, and you're activating it correctly then I hate to say iot but another one on the list for a diagnostic.
As for the lights - yes these were subject to a technical bulletin regarding water ingress. If it was just a few droplets and some steaming up, they generally said use the lights for a while and it will evaporate - but they had degrees of water ingress checks - and from what you describe these were complete warranty swap outs.
For the top of the range ultra prestige at £44k new plus options, the build quality and reliability is shameful. Lots of tech, but untested in the real world and with things like the wheels bouncing at the back over the roads, the driveshaft issue and a list of other things I'm aware of, it should never happen.