My other half seems to be wanting to harvest seed from a picolini that he has from M&S I'm thinking he doesn't have time to do this. What do you think?
Time is the least of the problems, RD. Squeeze the seeds into a small glass jar with as much of the tom's juices as you can get. If need be, add a tsp or so of water so that the seeds are sitting in at least some liquid.
Leave in a warm place, uncovered, for a few days or until a scum/mould forms. Add water to the container, swirl it around till the scum/mould separates from the seeds, let the seeds settle to the bottom of the container and carefully drain off the liquid. Repeat the process till the seeds are clean or tip the seeds into a very fine strainer and rinse them thoroughly under a tap.
Spread the seeds out to dry (ideally) on some coffee filter paper. The seeds won't stick to coffee filer paper. They will stick to things like tissues and kitchen paper. When the seeds are dry, they're ready to use.
The only problem is that Piccolini are a hybrid variety so the resultant plants won't produce fruit true to type. Still, it could be interesting to see what you will get.