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I definitely see where you're coming from - it totally makes no sense to keep your savings in bank accounts given current interest rates.
But I think your emotional head is conflicting with your rational head here.
Your rational head (rightly) thinks property is a better investment than bank accounts. But if you want your property to go up in price London would be a much better option. It has the added advantage of being where you currently live, not somewhere far away.
Your emotional head wants to buy somewhere in Scotland because Scotland and it's not London, but buying it then not renting it out would mean you'd stymie it as an investment. It's not going to go up in value that much, so the logical way to get a return from it would be renting it out. Airbnb isn't a terrible idea but who would be on hand to deal with anything that came up? Your emotional head wants to be able to go and live in it because it's disillusioned with London.
You would (probably) make more by buying somewhere in London now, then, when you're actually ready to move, selling it and buying somewhere in Scotland. Your theoretical London property would (probably) have gone up in value sufficiently that you'd be able to buy a bigger place in Scotland, or have more cash reserves. Houses in Scotland aren't going anywhere, so I don't really see the downside of delaying that purchase. It would actually (probably) be cheaper to do holiday lets in Scotland while owning a place in London, but that might not please your emotional head.
Your emotional head should probably think about this:
Should we move out savings into a house in Scotland (which we could buy outright)? We're making fuck all interest on our savings and we have enough to buy something up there. The idea is we could keep renting (and saving) here for now rather than move (and not particularly interested in being a landlaird). So: money in a house in Scotland > money in a bank account/ISAs?