Mattress King Size William Knight Inverary model sprung foam

Pocketed spring foam mattress with memory foam topper purchased 28/12/2017. Meant to be our last ever bed but with our advancing years we are finding it too firm. Good clean condition should give many years service yet. No offers, cash only (was over £1300 new) 5 foot by 6 foot 6 inches and very heavy. Level access but you will need to provide manpower and transport. (NB mattress only, no base)