I've been plugging a few gaps recently so here are four FDH discs that aren't on the Internet Archive:
FDH 320 - Magic Box / Moody Guitar / Lonely Guitar
FDH 343 - Beyond the Stars / Knock for Knock // Comedy Bridges 1-5 / Short Stings 1-6
FDH 349 - Beat Idiomatic 8-11 / Moonlight on the Andes
FDH 351 - Barnacle Bill / Silks and Satins
Two of these discs are in quite nice condition but the labels are literally turning to dust, as you'll see from the photos. I've cleaned the discs as best I can but there's still a bit of noise as the stylus approaches the label area. Less noisy copies of 351 can be found on WSBG's YouTube channel. This re-recording of Barnacle Bill is the one used on various TV Theme compilations as the theme from Blue Peter.
The Short Stings are interesting - they're not listed on Mr's excellent discography, nor are they listed under "Drama" or "Links and Bridges" in the catalogue. Beyond the Stars is the final FDH "Space" track that wasn't publicly available; can't say I recognise it from anything though.
I've included the raw rips. These run 3 percent too fast.