With charts like this, to say it is a North of Oxford snow event only is probably a tad premature. This I believe will very much come down to now casting. Although I'm sure the M4 will work it's magic for anyone south of it
above image taken from www.weatheronline.co.uk
After re-reading your post, I realise you weren't actually making a forecast, , but my point still stands, that anything really could happen from this system, especially as the exact track is not even nailed yet.