Calling Chris experts

[bretonbanquet]

OK, this one might be solved immediately or it might be a bit of a mystery... but I figure someone here will know.

I picked up a DVD of various Mac stuff, including some rehearsals at Benifold which I've never seen before. It's the Kiln House line-up plus Christine, playing in some room at the house, and they do gentle versions of 'One Sunny Day' and 'Station Man' interspersed with film of the band letting off fireworks (suggesting early November 1970) and generally larking about, also walking through the grounds of the house. There's also a short clip of Pete Townsend of The Who saying complimentary things, and a voiceover from Mick, with strange (Japanese?) subtitles.

The puzzle I have is this: after this stuff comes a very short song by Chris, with just Danny and Jeremy for company - filmed outside in the grounds, at twilight. It looks wonderful, really atmospheric, and Chris looks great. So what's the song? There's only a couple of verses, and the words suggest the song just might possibly be called something like 'Bye Bye Baby' - the lyrics go something like:

Bye bye baby, bye bye baby, bye bye
I said, bye bye baby, bye bye baby, bye bye... etc.

The first verse has something to do with 'see you when your train gets back' or something like that - can't quite make it out yet. Is it a cover, or one of her own? She plays simple keyboard with sparse accompaniment from the guitar boys. There's loads of stuff on the DVD - haven't even seen all of it yet - some stuff with Bob Weston also, and later stuff - looks like '74. Any information? I mean, it can't be that rare, or I wouldn't have it