Old Oak Staircase

[dans]

Osmo pollyx on our floors- hard wearing, grippy, breathable, fantastic product.

 

[Me!]

I've used Osmo Polyx on pine several times and it is excellent, I've never personally used it on oak though.
However, in France and especially as your staircase was previously in a barn, I'd be very tempted to use Xylophene first.