The alternative to relying on mates is to engage a courier. There are tons of them that specifically collect stuff from ebay, Facebook etc, and they have insurance etc. Most of the time I'd rather spend a little on a courier and save favours for when I really need them.
I got a really nice, almost new oven for about a fifth of the cost first hand, and paid £40 for a courier to collect it. It was easy to tell it was almost new because the owner put up the actual model and it had only been out for around four years (can't remember exactly now).
Freestanding ovens are a good call for secondhand because people get rid of them when changing to a fitted kitchen, rather than because they're knackered or they're upgrading from a crappy version. Quite often in that situation people will put their old freestanding fridge-freezer in the garage or something, but they don't/can't do that with ovens. Electric ovens are also easy to wire in yourself, or cheap to get fitted (£20 here in that London).
IME fridge-freezers are best bought first hand if you can afford it - they just seem to wear out more quickly than ovens.
Local shops deliver far faster than most of the big shops, if you buy first hand. Plus, at the moment, some of the big shops are still refusing to deliver to anywhere further than the pavement, whereas a small shop is more likely to just ask you to mask up and stand away from them for the five minutes they're in your house. Some also refuse to deliver above the ground floor, but with a local shop (for local people!) you can be reasonable and offer a bit more money for that instead.