Comparable to our old Tailor Tranquillity 1695 which we love?

Hi,
We are looking for a king size mattress to replace our bed tailor tranquility 1695 which we love but is on its last legs.
We like the medium firmness which this provides (I’m a side sleeper with hip pain, my OH front/ back sleeps). Budget could be up to £1500.
What could you recommend please?
Many thanks.