I have been looking for lining paper. Some is described as 150gsm (at B&Q), whereas others are described as 1700 grade or 2000 grade (at Wickes). (1) Are there 2 separate grading systems? (2) Or does 2000 grade simply mean 200gsm? (3) If there are 2 grading systems, which is the heavier paper, 1...
