Hi! I LOVE my iPhone 3GS. I also LOVE BBC iPlayer. So imagine my horror when one day I clicked on a radio show to play and it didn't work anymore! I pressed on the "Click to play" triangle, the screen flickered, but the standard Quicktime thingy didn't appear. Nada, zip. Same for TV shows.
At first I thought it was a problem with my wifi but no. Turned out I'd somehow turned off PlugIns in the iPhone browser. To reactivate them:
Go to Settings > Safari > Plug-Ins and turn it back ON :)
If I helped you out today, you can buy me a beer below. Cheers!