Hi there.  First time poster.  I've got an old BSA single speed project that I've just started stripping down to clean.  Lots of rust and sticky bolts.  Most have come off with a bit of work and lots of WD40.  However the right rear wheel nut is stuck.  I can get the left off ok.  I'm wondering if the little sticking out but is some sort of locknut that I have no idea about and won't budge.  Ideas appreciated.  FYI I'm using a combination wrench so that I don't strip the nut but not sure what else to use.  Photos attached. 

Rather than WD40 I'd recommend you soak it in Plus Gas.  Link below is for the aerosol flavour but it's also available in liquid form.  Good luck with it.  Perhaps the Mods could move this thread to a more appropriate section. 

perhaps to get a spanner on in situations like this to apply counter-pressure? 

Generically refer to them as drive dogs. In the auto industry they are generally used so you can do up a nut and bolt with one tool from one side.  No need for a spanner on the other side. 

Also helps when trying to undo bolts, as you can get your reaction force *right* next to your nut.  rather than through a long axle.  I suspect that's what it's here for.  Also helps when you have to take nuts off both ends......Or so you don't damage the threads leaning the bike up against things. 

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