Spaceweather website is reporting a density of 3.1 protons/cm3, so looks like its passed by and returning to normal.
I'm far from an expert in the science of aurorae, but according to SpaceWeather site, that data is coming from a satellite (ACE) which is quite a distance from earth, and is measuring the solar wind where the satellite is. Although the disturbance in the solar wind has passed (though another one due Jan 24/25 2012), I imagine the the particles (electrons, protons, whatever) rattling up and down the earth's magnetic field lines (pattern like the old iron-filings round a bar-magnet) can still do that at an increased level for some time afterwards (they cause the aurorae where the field lines dip into the atmosphere, i.e. in an annulus or 'ring' around each magnetic pole).
So who knows for tonight. Do try looking if it's clear. More likely the more north you are in the UK, since the 'ring' doesn't often venture as far south as the north of the UK, let alone the south. More likely looking north than any other direction. Various snags for me include useless northern horizon from house; streetlights; and it being cold! Maybe I'll venture out later a mile or two to get away from the lights.
