Looked at the phone and saw there was an update available. It's a two part update so clicked Update and the phone rebooted and on restart showed the little Android guy for a bit before presenting the usual Android main screen. Then after a minute another message saying Update available (the second part I guess) and it went through the process again.

After all that I now have FRG83D but there doesn't seem to be any visible difference between that and the previous release. Rumour has it that this prepares the phone for Gingerbread so maybe it's wait and see time.