Thanks IO540 - Your memory serves you well - I see now that the 'Lite' version was the product of a joint NATS/SkyDemon initiative. This link has the story -
SkyDemon and NATS launch free pre-flight planning tool for GA safety | NATS
SkyDemon Lite is the only package I have tried so far, and it seems to do nearly all the pre-flight work that I am likely to want for my (so far) unambitious plans for flying VFR around UK. The only thing missing is the ability to transfer the plan (or at least waypoints) to an SD card that can be inserted into the G1000 in the Club's C172. Garmin don't seem to understand the question when I put it to them! Anybody out there succeeded in doing it? (On reflection, this is so different from my original post that started this very productive thread that I think I'll float a new one).