I'll drop an e-mail to classicrocktours, although I'm sure there will still be tickets available when I get there on 16th June.
Well it sounds like there's lots of places to see on Rhodes, but I'm only there for a week so maybe not long enough to experience everything and still get a suntan and enjoy the live music. I won't be hiring a car as I've had some pretty awful experiences of Greek roads - although by all accounts Rhodes isn't too bad and boasts more tarmac than most places. However, I'm still traumatised by Corfu's dirt tracks and lack of signs

so will stick to buses and taxis, I think.
I like the idea of a trip to Symi Island - it sounds lovely and I enjoy being on the sea. Can you recommend a particular trip?
I think the only other thing I would like to know about is the temperature. I'm expecting very hot weather and packing factor 30 - sensible or wimpish?