Just order your permanent license key and your are fine.
Yes, for now Skydemon is probably the best current mobile device VFR moving map solution for flying in the UK (and some of Europe). But, it still needs the "only an additional aid" disclaimer, as it is by far not flawless. I really like it, but it appears to be in a critical development stage now. It is quite mature for such an additional application on non-certified platforms, but it is also on the edge of being "over-featured" (the thing that almost completely killed AirNavigationPro as a recommendable solution). If they are unable to keep the features rolled out in good quality, they are quite soon in danger of drowning in the complexity of european airspaces. The next follow-upper, Jeppesen MFDVFR, is surprisingly slow (too slow in development), but constantly closing in. But, for the next few cycles, they are in pole position, indeed.