NIMBUS,
Yes in the UK the windows on the pilot under training/test side are covered, normally the left seat. The Instructor/Examiner in the right seat can still see out of his side of the aircraft.
Out of circuit, under RIS or RAS ATC cover this is not a problem. The problem occurs on the end of an instrument approach when going visual and the screens are coming down. Flying a multi eng aircraft, with one engine at idle thrust, in 'sporting' conditions and trying to take down wobbly plastic screens with your 'spare' throttle hand is not my idea of fun or safety.
My IMC student manages very well with foggles only and we do a bit of cloud flying also to make sure he isn't cheating. So my vote goes with foggles!