Please help me. My son is in a perfectly fine single bed but it is not perfectly fine for him as he is over 6ft. I found a perfect double bed frame with drawers 5 months ago that's been sat in boxes since but I can't find a mattress. He wants a memory foam mattress but I just cannot decide. Anyone have any suggestions? Probably £350 max budget. I am unreasonable for taking so long to find one I know.