• The mech hanger being that little bit bent wouldnt put you 3 cogs in, and from what I can see there is no other obvious bend /twist to the body.

    This might be daft to ask ... but have you tried turning the pedals / chain since you released the cable? If it's not the limit screw or muck holding it in place, a chain (partcularly an old stiffed up rusty one) will do that just fine if theres no rotation made to allow the derailleur to guide chain back down to high gear.

    If thats not it, as @M_V says, back out the L + H screws – next port of call should be to get it off the bike and give it a really good clean, lube and flex all the spring / jointed parts.

  • Pedals have been turned. That’s just where it is. I could probably clean and GT85 the thing though. The bolt into the hanger seemed tight but could give it another look.

    Basically the lowest gear is cog 3 and the highest sends the chain into the spokes.

  • Hanger looks slightly off but I'd try to release cable tension first

  • Doesn't sound like it's sticked up with gunk, especially if it moves inward to big end freely.

    Detach cable completely, chain off and double check the H screw is backed out all the way. Also might be worth checking if theres nothing caught in behind / inside the mech itself (twig, small stone, etc). Would be easier with derailleur off bike

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