6 Months notice

Possession - Section 8 and Section 21

So my question is about the new Government changes with getting possession of your property back. I am posted overseas, and wish to move back in to my family home once I leave my current job. It is rented on an AST, which was initially for 12 months. Do I now have to give my tenants 6 months notice to leave? Or do I just not have to renew the tenancy at the end of the 12 months? The problem is I will not receive 6 months notice when my employment comes to an end, it may only be a month or two at most particularly now during COVID. If I cannot gain re-possession as I would normally have the right to do(ie give two months notice) then I will have to temporarily rent somewhere for 6 months (as this is the minimum AST contract) which seems terribly unfair. Also I will have to find and pay for storage of all my belongings because I will not be able to get my furniture delivered to my family home straight away. Are the NRLA campaigning against this sort of situation, because it seems to me totally unfair and impractical for those landlords who are simply renting their family home. Please advise, as I may have misinterpreted the changes. Thank-you. Steve