Thank you very much for the information Will! The guidelines and tips on what to look out for were easy to follow!
I gave it a generous (but not too generous) water last night. I think it even looked a bit perkier this morning (is that possible?)
Since the tree is so dried out, is it likely that the soil will dry faster than it would otherwise?
One more question - should all of the roots be under soil, or can a few bit be sticking out?
Thanks again