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Re. mech hanger alignment - issue seems pretty prominent around the smaller gears (rather than the larger ones where the hanger alignment would be an issue), which is why I didn't think to check the b-screw alignment too closely.
Ime, indexing issues at one end of the cassette but not (or less) at the other pretty much always means hanger alignment is out. Which end works/doesn’t is irrelevant.
As for knowing what mech you have, the model number should be embossed on it somehow, probably the bottom/back of the main parallelogram linkage. Look for “RD-M???”. Similarly, model number will be somewhere on the shifter.
M_V
As a quick edit, I realised that the sticky shifting runs both ways - often need to shift twice in the direction I'm going then back one to get it to move chainrings. Interestingly it always seems that the first click doesn't move the hanger at all, then the second click does.
I checked with the seller of the bike and he says the bike parts are 'as new' (he did not seem the sort to be doing any fettling whatsoever), suggesting that it came like that from the shop (not sure which!) - seems unlikely a factory spec would pair a 10 speed mech with a 9 speed shifter?
How can I tell what sort of SLX mech I have - never dealt with these before. Not sure which deore shifter I have either but it seemed like the m590 from googling pictures.
Cables seem fine (at least the exposed bits I can see) and the mech does shift up and down the range, just not with much precision.
Cable routing - no idea how it's meant to go through the mech, seemed pretty direct out the hose and into the clamp where there's a groove for it (I've come across funny front mech routing on road bikes but didn't think to check there'd be an issue here).
Re. mech hanger alignment - issue seems pretty prominent around the smaller gears (rather than the larger ones where the hanger alignment would be an issue), which is why I didn't think to check the b-screw alignment too closely.
Thanks for the really detailed diagnosis - will go give those another run-down and report back, and also provide some photos..