In all the years I’ve owned property to date, I’ve never had to sever notice on tenants 👍, we just come to an amicable agreement & they move on 👍. I’m just drafting a new ASTA from NRLA site & completing section 7 re serving notice & it states that if I need to I will send by 1st class post, great but dated IMHO. I always setup WhatsApp groups for all new tenancies & we communicate through that including issues/concerns/fixes/leave dates etc. Is this not a viable alternative option?