Replacement for mattress supplied by John as Mobilemattressman

We previously purchased, some many years ago, a Limoge mattress from John when he was trading as the Mobile Mattress Man at his suggestion. It has served us very well over the interim years but it is now evident that it is approaching the end of its useful life.
My question is what would be the equivalent mattress in your range today?
The bed is a wooden slat double size
I weigh about 15st
My wife weighs 19st
Many thanks for your advice back whenever John and I look forward to hearing from you.