Just a thought from someone who doesn't actually use pscan but understands the problem (I think!). Could you set up a new user account in Windows (or whatever OS) and define that account for UK settings? I've never tried this but it seems logical that it would be possible. At UCL, there are students from all over the world sharing central cluster PCs so, presumably, they can use their own language settings?...
Don't shoot if this is nonsense!