Many thanks to you all .
I'm nearly there.
For 20a Political party(6,4) I had Fianna Fail
.If that is correct Storting ( which looks right) won't fit in.
23a. Heavy, solemnly dull(_6) I had Stodgy which knocks out Storting again.
13d. Fixed wooden church pew(5-5)?h?i?- stall?