Dear Sirs, we would like to order a super king base and headboard from you. However, we have tried out a John Lewis mattress which we were going to buy to go on your base. It occurred to me that you probably have an identical zip link super king size mattress. Which of your own would directly compare with: John Lewis Natural Collection Silk 14000 Pocket Spring Zip Link Mattress, Medium, Super King Size. We would ideally like to buy it all from you! Thank you in advance for your help and advice in this matter.