Help with 2PR - 1936 shell identification please

Hi, can anyone identify or provide an info on this shell case (see pictures)? It measures approx 40mm x 160mm. I assume the 1936 refers to the year of manufacturing?

And here is another picture of the shell (measures about 160mm long)

The cartridge case is the 2 pr No.1, as used in the British naval “Pom Pom” AA gun. The “2 pr II” and “VIII” refer to the most common versions of the gun in RN service. The “Sub-Cal” means that it is used in sub-calibre training systems (the gun being attached to, or mounted within, larger guns). The LA refers to low angle training systems (the high-angle case was shorter).

Thanks Tony that’s great

40x158R from Tony’s site?