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Talcum powder the stairs and put a fresh carpet on.
Replacing windows but if in poor condition, may allow you to get the sale price you want. I.e, people wanting £15000 off for £5000 worth of window replacements.
Electric rad in the loft room to save installation cost and keep the room warm during viewings.
Tidy up the small bathroom. Removing a bedroom is rarely a good idea for maximising sale price.
Do as little as possible to make a good first impression, ans also not to flag anything to the surveyor (signs of damp)
As for the stairs I'm not sure what it would involve. There's quite a bit of movement, and I've tried some bodge fixes with screws that helped a bit but the staircase needs more professional help I think.
It sounded fine before I ripped the rank old carpet off them and made them look nice.