Which was replaced in May 2022 by a poorly timed shuttle from Newbury.
This is I think one of the best examples of GWR being too big, the shuttle timing. There are so many examples of poor timing, for example the Henley Branch. To get the Henley shuttle, using GWR services, from London is too short of a change, ranging between 3 and 8 minutes, and is usually on the shorter side, and is often missed by the London train. From Reading it is almost always a 30 minute change, as the stopper departs at exactly the same time as the shuttle leaves, making a change impossible, and forcing you to watch you train pull away.
Returning from Henley, towards London you are again left with a very inconvenient 4 minute change, which is often missed. Going towards Reading there is another 30 minute change, as the Reading stopper leaves seconds before the shuttle arrives, but if you're lucky you make it and it's delayed. There is no feasible reason the Henley shuttle could not have it's timings changed, as in fact they do during the regatta, so that all the waits are around 10-15 minutes, 20 at most.
But in my opinion this actually shows what GWR cares about, timings are timed perfectly for trains to/from London, assuming trains are running on time, which they never are. GWR only truly cares about trains heading towards London. Every journey is timed to get people to and from London, and if you live further down their network their services get worse and worse. Take for example the Didcot - Oxford shuttle. It is the main way for people to get from Oxford to the West, and yet is hugely under provisioned. Usually a 2 car 165, which at rush hour is full and standing, and I've seen it leave people behind before. Yet GWR does nothing, not even change it to a 3 car train.
It's been mentioned, but GWR being so big gives it a huge monopoly, especially operating in areas with often poor bus services. They are one of the most expensive operators in the country. From what I've found traveling by car is almost always cheaper, even with current fuel prices, and using a railcard. This doesn't really keep to the whole travel by train rhetoric.