"Walk Through the Fire" is one of my favourite PG b-sides/movie tracks.
A collection of all of them would be so good - we can at least fantasise about it!

Actually, I've been listening to a lot of the 'rare' stuff recently.
"Out Out" has some interesting moments, but it doesn't really hold together so well as a song.
"In the Sun" has a stunning vocal and is a really beautiful song and original arrangement.
"Quiet Steam" is really good!!
"Party Man" is a lovely emotional song - Peter's vocals so often bring tears to my eyes.
The 1993 'slow' version of "Games Without Frontiers" has another great PG vocal.
There's the 2 alternative versions of "Diging in the Dirt" too; the instrumental mix, which I love and the one with the extra verse from the "Kiss that Frog" single.
Although one track I like a lot - though not a b-side or anything, but an old demo, is the early instrumental demo of "No Self Control", or, "Don't Know How to Stop" - despite it not having vocals, I think the raw power gives it a real edge, and it's an interesting insight into Peter's creative process back in 1980.