Clue to 20 down is Type of French White Wine . The clue gives 8 letters and I have s?n?e?l?'
The Clues across are 19 across Political Killer (8 letters) for which I have Assassin;26 - Not continuous (12 letters) which I have completed as Intermittent which seems to fit in with the relative down clues.
30 Across clue Period after the fall of the Roman Empire 2 words each of 4 letters. I have Dark Ages as my solution.
Final Across clue 35 Area of uncultivated hills (8) letters. My solution Lowlands.
Can any person out there help me to solve 20 Down?