I completely agree with you drxx. At first I thought this was beyond me, but the two lines slowly began to emerge. This led to a PDM regarding the 5 perimeter clues, which when knowing the definition, became quite easy to solve. Once all this was entered most of the radial clues became solvable. However, with no cross checking, several of the radials were a little obscure and caused me a great deal of frustration. This is an excellent puzzle, but with a little more cross checking would have been, in my humble opinion, one of the best of this year so far. Solving the last 6 or 7 radials, with no chance of help from anywhere else, spoilt it just a little bit for me.