Escalators - yes, the LU model would be pretty good nationwide. Stairs - I'm not sure how that would work. After all, most normal people don't just stand on the stairs waiting to be moved somewhere, with other people trying to walk past them. Anybody who decides to loiter on the stairs without a very good reason at busier stations should certainly be moved on ASAP, though.
Standing on the right is signed at most stations managed by Network Rail. Works well at Leeds during the peak. A few "can you stand on the right please" from regular passengers serves to bring the strays into line