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Yup b screw been messed with = gears no worky very well.
From memory that is the right 9s slx. It'll be written on it exactly what it is
Pic of how the inner is clamped in the rear mech.
Check the cable means park it in 1st, click it down a few then pull outer cable from the frame stops and slide it ban and forth, make sure no kinks and it's very smooth with little friction. Then put it back in the frame stops.
Have pictures if it helps. Also think the issues are in the whole range; after riding more today it seems like less indexing as just very sticky shifting (pressing twice sometimes does nothing then three times jumps two or three gears) Changing the cables is going to be my next resort but still waiting for them to arrive in the post. Am hoping that fixes things and will report back if not - thanks for all the help!!