Specifically ordered a 22cm thick 'medium to firm' mattress from Bedz Online via B&Q but similar to a previous commentor got a 17cm thick one that leaves a gap between it & the bottom of my headboard. It's also to my mind a very soft mattress and as soft as the one I was originally going to discard. They did at least get the 'double bed size' correct. Had a couple of replies from them asking for photos of the mattress sent, then radio silence albeit just a few days, but not even an acknowledgement of my last comms to them. Wasn't intending on leaving a review so early but reading the other reviews, this is clearly not a one-off If this isn't resolved to my satisfaction in due course I'll be dragging B&Q into this too as their standards have plummeted over the last few years. I'll leave a revised rating if Bedz Online pull their socks up, but reading these very poor reviews it looks unlikely that will happen anytime soon. Got their mattress propped up in the hallway while this issue gets resolved so not ideal.