Received the mattress that was graded as 1 which is soft.
It was in fact extremely hard, when I queried this with Materessnextday they said the grading is determined by the manufacturers who is Hyder Beds. Apparently there is no official grading system and it is apparently down to opinion? I Don't think this is good enough. I returned it to Materessnextday and was refunded, but I had to hire a courier service and now I'm £61.00 down for the whole experience.