+1, the pace is as easy/hard as you make it though*, either sit on someone wheel for the whole ride and take it easy or spend the whole ride up front doing the work, mkaes a huge difference after a couple of hours. The few times I’ve been out with Reading CC though it’s ended via Henley, which is a pancake flat stretch of road, and the pace just seems to go up and up and up and up, I’ve made the mistake of being right at the back a few times, you either do twice a much work yo-yoing off the group or someone ahead does the same and your too far back to catch up, easy to see why road rides are so tactical.
*assuming your fit enough to at least keep up in the ‘slow’ group.