Owning your own home

We're probably going to be moving out of our place in the next couple of years. It's a nice-looking place of a good size, but despite us having chipped away at a lot of the things it needs doing, there's still a fair bit of work it needs.

Which of these, if any, are worth doing in terms of being likely to pay for themselves when it comes to selling?

• Roof insulation in the loft rooms (they're freezing in winter, stifling in summer)
  
• Radiators in the loft rooms (inefficient without the above, but might make it more bearable for a lower price
  
• A decent sized family bathroom in place of one of the bedrooms
  
• A renovated small bathroom in the place of the current ugly tatty small bathroom
  
• Stairs that no longer creak
  
• New windows (it's a corner house with two sets of double bays)