I doubt it makes much difference anyway. UK 240 V appliences always worked just fine on Irish 220V supplies. It's well within the tollerances and has been for years.

You can't even guarantee 220V / 230V or 240V especially in rural areas in any country really. I wouldn't be supprised to see 220V at an outlet in the UK and I have seen 210V in ireland in rural areas at times.