I'm aware of the regs, the actual style of the spindles in mine is vertical, not horizontal - the pic I showed is for the colour/timber. Yes, and mine is coming from Poland too.
Mind you, and it's a personal thing, the regs would not dissuade me one way or the other - we just liked the vertical stainless spindles with maple inlay, so we did a spot of mixing/matching on all the components.
You don't hear of hordes of european's killing themselves on shorter/steeper/shinier/open riser/horizontal railed stairs...........so you'd have to question the sometimes nanny ideas out there on things like this, sometimes.
btw, you can have horizontal rails - they just need to be mounted off-plane, i.e. with the handrail inside the plane of the rail - leaning in, if you like. An example of this in a public space is the boardwalk on the liffey, iirc, and the new pedestrian bridge across the river Corrib at Wolfe Tone bridge, in Galway........