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23a - ignore an old, decrepit , statesman (9)
i have o?e?o?i?n
25a - He had a list put out twice (2-2)
I have k?k?
Haven't a clue and as usual any help welcome

Oregonian.
KoKo.

Thanks Rusty

neither in Chambers as far as I can see- but wouldn't have got them anyway

Someone from the state of Oregon is an Oregonian.
It is an anagram.
KO is to knock out or put out.
KOKO is a character in The Mikado who had a "little list"
Hope this helps.

KoKo is the Lord High Executioner in The Mikado, dobbo. He "has a little list" of ones who won't be missed. It's traditional for the actor taking the part to add his own to Gilbert's list.

You may have heard of the Lord High Everything Else from the musical. He was called PooBah.

It's possible the Pooh Bear (Winnie-the-Pooh) was named after him, though probably not!

I'm pretty sure these are correct but some of the parsing eludes me, help appreciated.....

15a Fluctuating that involves one in endless meditation? (2,5) - YO YOING (Fluctuating)

4d Book is one that's got abridged about one of the Bourbons? (7) - BISCUIT (Bourbon)

16d Drive up motorway, turning left before hill (9) - IMPULSION (Drive)

15, "yog(a)
"that" is "yon"
one is "i".
4,
b for book
"is" in clue
abridged is "cut"
one is "i"
16,
"Up" in clue, "M1" is motorway
"l" is left.
"Sion" is the name of the hill that Jerusalem is built on.
Often called Zion.

That's excellent, many thanks Rusty.

Teamwork, Brendan.
Glad to help!