How heavy is the Emma Original Elite, and can one person rotate it?

It is one of the heavier mattresses we have tested: at 28cm with a tall pocket-spring unit plus foam layers, a double is a two-person lift. One person can rotate it on the bed by walking it round a quarter-turn at a time, but carrying it upstairs or flipping it onto its side to change a valance is a job for two. It does not need flipping, only rotating head to foot every three months or so for the first year, so the weight is a moving-day problem rather than a weekly one.