Well he might work permanent night shifts like me
Kev - the cartridge in your photo looks like an Acos M7 derivative, which is definitely a magnetic cartridge. The cartridge body would have to be glued back into the plastic shell as I don't think it was designed to clip in. There are very few magnetic cartridges that clip into a housing.
Here's a comparison photo of the Pickering and a Shure M75 slimline. You'd have to trim the bracket to get it to fit.
78 styli for the Pickering and Shure cartridges are readily available.
What amplifier are you planning to use with this deck?