We (single family, two adults, two kids, cat) were issued a section 21 by our landlord at the end of April stating upcoming legislation and current rent arrangement made it unviable to continue our agreement (monthly rolling contract). We've been here 13 years and are lucky enough to not have to increase the rent in this time (they've not asked). They're not the original landlord. They bought the place from the previous landlord approx 10 years ago while we were already here.
Landlord has not done repairs when asked (2 and a half years without having a toilet fixed, and no contact from them about despite constant chasing among other things) also has not had a gas safety certificate done every 12 months (new boiler installed 2021, inspected 2024 then that's it), our EPC expired in 2020 and we've not been given an up to date "how to rent" booklet since we moved in. We have been talking about moving anyway for perhaps the last year, but that was always with an eye to the future. My question is, how valid is the Section 21, and if we move anyway can I take them to court afterwards and what can I expect from it?
TLDR: Is Section 21 valid if landlord hasn't done what's asked?
Thanks in advance for any advice.