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drxx, by "the north-westernmost cell in the ciphertext region which contains an ambiguous clash" I meant "the north-westernmost cell ... of the four cells which contain an ambiguous clash", which are, as you say, in the south east of the ciphertext region.
(Obviously, I need only one correct cell to resolve the other three.)

Yes, I wondered why you were looking NW hence my -
''(but I can't see why this would be ambiguous if you have all of the answers and only real words appear outside of the area).''
But we got there in the end.

drxx #119
As I said in my original post, the extra letters I have extracted from clues, give me complete gibberish — obviously my fault. If I could have found the keyword, I would have happily spent the time verifying everything was correct by enciphering the message I had guessed.

Apologies for any irritation caused by my ambiguous posts about grid ambiguities!

No need to apologise, jif73 (I often get tetchy}.
Did you manage to get the first 7 letter word from the extras?

If you have then a search for ''code +'' the next 4 letters of what looks like gibberish might give you a hit.

The first seven letters make a word. See my post above for one reason they might not. The rest might look weird, but Google it…