Fiendish and very clever though have seen a similar one once, was that you too? Didn't work it out but had fun trying, and even when I saw the answers getting it worded your way may have been fun :)) well done for doing something a bit different to get the old grey matter going!

Completely stumped me. Didn't get a single one!

Flawed grid. The solution is not unique. Swap D for A, A for N and N for D.