It happened yet again recently, this problem.
I was travelling from Worcester to Birmingham.
What should have been a 4 car train was reduced to a 2 car train, towards New Street, on a busy Saturday morning. The train was absolutely packed.
When I boarded with my bike, three people were already sat on the fold-down seats in the bike space. I asked them to move. Two of the people got up, and then had to stand, leaving one person still sat there, making it still impossible for me to store my bike. I had to ask him yet again to move, at which point he vacated the seat and then he also had to stand.
It was really embarrassing for me to have to ask. I felt really bad, so I actually got off at Droitwich and waited for a quieter train towards Snow Hill.