Thanks everybody - got it all sorted including track and band names.
But it is slow. Not only am I having to resave all my stuff to MP3 but then I'm up and down stairs from the computer to the car. To be fair I've been saving my songs at the highest bit rate (320 I think) so I might try saving the next few at a lower bit rate in the hope that they save a bit quicker (and presumably use less memory on the 510?).
Whether I continue to do this when the novelty of the 510 has worn off though remains to be seen!!!!!