Prospects for an experiment to measure $BR(K_L \to \pi^0 \nu \bar \nu)$ at the CERN SPS

We are investigating the feasibility of performing a measurement of $BR(K_{L}\rightarrow \pi ^{0}v\bar{v})$ using a high-energy secondary neutral beam at the CERNSPS in a successor experiment to NA62, to run in LHC Run 4. Some preliminaryconclusions from our feasibility studies, a description of the design challenges faced,and the sensitivity obtainable for the measurement are presented here.