edit, do not buy! Sags in middle, gives back pain
The delivery guys were great and called when they couldn't find the address. Had no issues with my order and the mattress is heavenly. Also received 2 pillows, they're a bit hard but they were free so great to have as spares.
Edit 2 years later(30/12/2022):
For the past 6 months the mattress has got gradually worse to a point I can't lie in it for over 6 hours or I can't get out for the back pain it gives me. I'm barely 31 and I've never known such back pain. It sags horribly in the middle but not "4cm visible dip" for the warranty to kick in. I'm only 56kgs not a big person. It's only me on the double bed always have been so I'm super disappointed. This WAS the best mattress I'd had but with just a 1 1/2 years lifespan for something that expensive I'm really disappointed. As I happens I can't afford a new one with the constant price hikes.
I've rotated as the website says, used a thin mattress topper, solid bottom with only 3cm gaps between thick 50mm slats that doesn't have give even when I stand on them if the mattress was off the bed.
Considering to jeg get my airbed out and sleep on that from now on as the £79 luxury airbed is way better than this.
In short: Can't recommend at all, doesn't last even 2 years, sags in middle, gives insane back pain even when a small person uses it.