"Wish You Were Here" is a great song... one of my favorites on 'Mirage.'
The instrumental outro is terrific, and I usually end up listening to it two or three times.
I was going to ask if anyone knew anything about Colin Allen (he's the fella who wrote the lyrics for "Wish You Were Here"... Christine only wrote the music), but I decided to look him up myself.
Turns out he was a member of John Mayall's Bluesbreakers for quite a while, and has also worked with Bob Dylan, Donovan, Rod Stewart, and Robbie Patton (of "Smiling Islands" fame). He's also had songs recorded by Paul McCartney & Wings.
Not bad.