We bought an Eve mattress (kingsize, hybrid) a few weeks ago, and have been really pleased with it. We have the Eve pillows as well, which are memory foam, and have really helped with the fact I used to wake up with a stiff neck regularly.
Eve does a referral scheme - I have a code to get £100 off an Eve mattress purchase (I get a £50 Amazon voucher too, so it's not completely selfless!). If anyone wants the code, please DM me as it has my real name attached to the referral.
We bought it because it was the top-rated on Which? Magazine and we haven't been disappointed.