Ask an Property Solicitor. Get an Answer ASAP.
I am a solicitor.
Sorry to hear this.
However, the good news is that tenants cannot be evicted without a court order granting the owner/landlord possession of the property. So none of you need to leave simply because you have been served with an eviction notice. If the flats are sold, the new owner would be tied to your tenancy.
May I help further?
We do not need to have a call, please do not worry about that.
You may refuse entry to all these people, no-one can force their way into your property without your consent as it is a breach of your right to peaceful use and enjoyment of your property as a tenant.
I hope my response was helpful.
All the best