But, I feel that's taking advantage of the fact my landlord is a relaxed kind of guy who hasn't chased us up for the contracts.
Just a quick note about this - I don't doubt that your landlord is generally a good guy, and I think it speaks to your character as a decent human that you don't want to screw him over.
Here's the thing about you being on a periodic tenancy: the only way to get you onto a periodic tenancy? Is to basically not "follow up" getting the signed lease agreement back from you. And, it's kind of an important document for a tenant, because it sets out the responsibilities that the landlord has. You're in a difficult (ie shithouse) position if you need to enforce your rights under a periodic tenancy. Because you have to fall back on legislation and common law. Which means lawyers. Which means enforcing your rights as a tenant? Becomes reeeeally expensive.
And because he hasn't followed up on getting those signed leases back from you? You now have all of the safety net that goes along with being tenants on a periodic basis: none.
Unlike when you have the rather important lease, in writing and signed? Which gives you a whole lot of rights about not getting kicked out? Periodic tenancies usually mean that the tenancy can be ended at 4 weeks notice.
By either party.
Without any legitimate reason.
So, while you might feel an obligation to this landlord for being a nice guy? You actually have very little security to stay in that property as periodic tenants.
Say the lawsuit gets sorted and your landlord decides to get the subsidence work done to make the property safe and decent to rent out? Easier to do with vacant possession, and that's super easy to get, whenever he's ready to do those improvements, by giving you 4 weeks notice. And you're booted.
The benefit of that to him? Is not only that he can kick you out with only 4 weeks notice? He can also jack up your rent - at 4 weeks notice. He can improve the property and rent it out at a much higher rate - giving you only 4 weeks notice.
See how that's not exactly an 'easy out' for you?
This is not me saying: your landlord maliciously planned all this from the get go and is secretly plotting to turf you both out.
It's simply me saying that if you only need to give 4 weeks notice? Then you only need to give 4 weeks notice. Your landlord will take care of himself and his investment property just fine - that's not your issue to worry about.
And certainly
isn't a reason to prioritise being generous to your landlord over getting yourself out because you absolutely need to do that. Your landlord's property interests don't come before your needs.