My reverb is creaking/clicking I think around the seat area and I can’t seem to sort it.

Followed things that have previously been suggested on here and have so far done:
Cleaned clamp and seat rails and put a thin layer of grease on them
Cleaned seat clamp
New fiber grip on post
Copper slip on all bolts

Fairly certain its from the reverb, only happens when I bounce on the seat.

Anyone else had this problem and how did you sort it?

It’s your saddle.

^^^this

Yep, your saddle. Mine does that too. Its where the metal rails go into the moulded plastic saddle chassis. Not sure if you can squirt WD40 or something between the gap or not. I don’t mind about the odd read so long as I know its nothing serious or me.

Is it a Charge Spoon?

No, it a YT own, about 2 years old.

I’ll try some WD40 on it

A spray of WD40 and a quick up and down the road test and it seems to have gone away for now.

Usually the plastic/rail interface in the seat if tightening the bolts doesn’t help. A spray of GT85 or similar helps briefly but comes back next ride I find.