I have completed everything except P2. I have two problems. The solution is indicated to have 9 letters, but my only remaining space has just 8 (RH end of line 5 of grid). I'm pretty sure that the indicated 9 letters is wrong, as this gives odd numbers of clues with 8 and 9 letters each. Secondly, as far as I can see, only one word in the dictionary fits the pattern PO_I_E_Y, but I don't see how to get that from the clue. Beyond the dictionary, I have consulted the full catalogues of E1's known compositions (with titles in English and in German) but find no help there either.