I know one person the wind up radio benefited enormously
A few years ago I found myself on a mental health ward but that's another long story.
One of the other patients was obviously psychotic and walked around clutching a small transistor radio to his ear and talking back to what ever he heard. One Sunday evening the batteries in the radio went flat and there were not enough staff on duty to send someone to the shop to buy some replacements. The poor bloke went completely ballistic and lets just say his evening didn't end well.
When I was discharged I sent him a Baylis wind up radio so he never had to worry about the batteries going flat again. I had a letter from the consultant about a month later to say I had made a big difference to this one guy with my simple idea.
I wrote to Trevor Baylis to tell him this story and he wrote a fantastic letter back saying that he was so glad he could indirectly help just one person.