My aim is to get some seeds, but can anyone tell me the proceedure for extracting them.

Try this link.

http://www.bushmansfriend.co.nz/xurl/PageID/9165/ArticleID/-31971/function/moreinfo/content.html

(I usually wait for the birds to do their thing. Check for seedlings at the base of nearby trees.)

They don't go red - they go orange - quite a dark orange, and then they go wrinky like an over ripe tamarillo.

They'll tolerate frost down to -5C but, as you're predicted to have snow this week, they might get a bit battered.

They aren't long-lived. Usually a pioneer species in open ground or light bush. They appreciate shelter from the wind as they can be quite brittle when they are older.

Despite the very limited hours of sunshine, I manage to get two fruits that had turned orange. I'd read about how to 'process' Tomato seeds, so I gave it a go in the same manner; leaving the seeds in water for a few days, then rubbing them though a sieve. They're currently in a fridge awaiting some warmer weather. We don't have a greenhouse, so I may try to start them off indoors.