Yay, the forum's back. Thanks for getting back to me. All sorted now. Just to help anyone who has similar issues:
Saturn - it works now that I just use the bin/cue format for roms
Neo Geo - Bad roms. Just tried from a different rom set and works great.
Playstation- must have been a bad download for that particular bios. Got there in the end:)
Love love love Batocera so much.