Warren, the UK's leading independent carton & graphical board and paper stockist, has announced that in a continued extension of their close working relationship with Stora Enso, they are delighted to introduce a new reel-to-sheet service for the market leading folding boxboard, Tambrite H/S. Warren, the UK's leading independent carton & graphical board and paper stockist, has announced that in a continued extension of their close working relationship with Stora Enso, they are delighted to introduce a new reel-to-sheet service for the market leading folding boxboard, Tambrite H/S.