Ask an Property Solicitor. Get an Answer ASAP.
I am a solicitor.
The notice may be signed by your landlord or on behalf of your landlord by an authorised representative.
You may request to see evidence of authority, but they may refuse to show you such evidence.
Also, you do not need to vacate the property by the date specified in the eviction notice, your landlord would still need to go to court for a possession order against you.
May I help further?
That is up to you.
He cannot evict you without a court order and you may call the Police if he tries to.
All the best