While we have reinstalled the first floor, we don’t have a staircase yet. So getting upstairs is via a set of ladders. Not great, particularly when you are carrying tools/materials.
So we decided to install some temporary stairs. Since they are going to be there a while, it is probably worth the £150-170 that it would cost. But we would luck and one of the local joiners workshop had some stairs that had been produced for another customer (Joey) and he no longer wanted them.
And all for £50! A bargain.