Was that definitely via Coventry though? I think I remember that during the day alternate services bypass Coventry and Birmingham International, instead running through (without stopping) Solihull. Current timetable with only one service per hour, … all of them do seem to go via Coventry. Wouldn't be surprised if later in the evening they all go that way of course, even in the old days.The December 2019 timetable shows a 22.02 Reading-Birmingham on Mon-Fri, 21.45 on Sat and 21.42 on Sun.
When I saw your message I had, coincidentally, just checked that -- I was fairly sure that I'd already checked it for the weekday service but less sure about the weekends. It turns out that the 21.45 ex-Reading Saturday service was non-stop from Leamington to Birmingham (so the last Reading-Coventry train was the 21.15), but Coventry was indeed served by the last train on Sun-Fri. Apologies for not checking this properly in the first place.Was that definitely via Coventry though?