yeh we just got triple glazing from NorDan but it was through a friend so I don't know exactly where they are based etc. check out their website...http://www.nordan.ie/
I do know that they had to be precisionly measured,custom made and well fitted=very expensive but well worth it!our friend found guys to fit them.
you can get a blinds fitted which go in between the panes of glass and are therefore very handy and very clean.
big job but the parents are dead happy after so many years of single glazing!!