Today:
09:59 Grateley - Basingstoke. 5 coaches, lightly loaded in my coach (4 passengers by the time it reached Basingstoke)
10:48 Basingstoke - Reading. 8 coaches, quite a few looked to be boarding the front unit and the 7th coach was ~ 15% full. A good number at Reading waiting for it, but both times could be local travellers using XC instead of GWR due to the timetable (GWR running an hourly Basingstoke - Reading stopper which departed a couple minutes after the XC and an hourly Oxford fast which departs Reading 3 minutes after the XC)
11:26 Reading - Tilehurst, 8 coaches. I was in coach 5 and there was a handful of passengers
17:00(ish) Reading West - Basingstoke. 3 Coaches, 2 others in the leading coach (again might be due to an XC running a few minutes in front soaking up any Basingstoke travellers)
17:36 Basingstoke - Grateley, 8 coaches. I was in coach 5 and there was a couple others
Car park at Grateley had 2 vehicles in when I arrived at 09:50.