We're delaying departure so as not to arrive in the middle of the thunderstorm. This evening looks decent enough, and it looks like Saturday's weather is getting earlier in the day (which is causing disgruntlement from the resident fair-weather cyclist, but should provide the traditional BRITISH aesthetic for the coronation at least). Looks dry from Saturday evening.
ETA: And now we're being delayed by nowhere to put the car to load it up, even using parking-like-a-fud tactics. It's currently far enough up the hill that my knee will object to all the carrying. Cycle-camping is so much simpler.
ETA: Got a parking space. Car loaded. Leaving imminently.