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Thanks Mack.
I always seem to forget this island!

This was very fine, and I shall be chortling over the wording of (b) for a while to come.

Buzzb@18, I think the flaw you mention, which gave me pause for a while too, is covered by the fact we are told that 11 new words are made. The replacing only changes unches and resolves clashes to the downs, and if it didn’t in any position that would be another new word made.

I am left with one head scratcher, which is the wordplay to 11d “Truce promoting partition’s end” — I know the correction and can see the definition but if anyone can nudge me to understand the wordplay that would be great…

Mooncow, 11d takes a word normally used as a preposition, but is also "A partition between chimney flues".
(Last entry in Chambers) The final letter is "promoted" for the entry.

Thanks mattrom! Wow, that took me a moment even with your hint -- not a word I'd ever considered as a noun. But Bradford's does have it under 'partition' so I guess I should have been more diligent...!