Ask an Property Solicitor. Get an Answer ASAP.
Hello. My name is***** am a solicitor here to help you with your question. I will respond as soon as practicable which will be some time today.
Hello. As part of the purchase you need to ask for a copy of the tenancy agreement. That should say which notice periods apply (and bear in mind you would not be the landlord until the purchase completes).
If you are not provided with a copy of the tenancy agreement then all is not lost because almost every residential tenancy which is granted in England is called an Assured Shorthold Tenancy. The terms of it are determined by law. They don't even have to be in writing. What there needs to be is a property, which possession is given to the tenants and a rent paid.
If you want to remove the tenants, you would be doing so on a "no fault" Section 21 notice, ie they haven't done anything wrong you just want your property back. The notice periods for these notices have been made longer due to COVID, so in most cases you have to give 4 months' notice for them to leave. There is a lot more detail about this on this website https://www.gov.uk/evicting-tenants/section-21-and-section-8-notices.
I would try to get as much information about the tenancy now, as part of the sale process. Such as, where is the Tenants' Deposit held? The Seller should answer these questions.
I hope this has answered your questions, I am happy to clarify anything although will now be offline for a while.