Possibly the hardest crossword I've attempted. One and a half weeks, and been stuck on the last three for a day or so:
7d Press probing case of dubious lover slipped back (6) ?URIE? (one of the L's in the clue is redundant)
7a Shabby dressershard to get advancing English lines (6) ?C?RES
42a Horse steps up to platform bearing guerilla head (4) ?ERC
(for the across clues the number represents the grid entry - one answer needs its head removed, the other a name for a bird removed).
Any hints appreciated