I think it's awful that anyone should have to wear earplugs to cut out noise from unreasonable upstairs neighbours.
I hope you have a decent landlord who will put down a carpet upstairs. In the meantime, I like Pascal's suggestion about asking them to come into your flat and hear someone clomping about upstairs.
Good luck!
The Devil In The Family: The Fall of Ruby Franke - BBC IPlayer
Labelling cake tins or cutlery you have loaned.
Daughter not allowed to know new baby’s name until she visits him
