ummmm,
Sadly that USED to be the case,but the wonderful Margaret Thatcher(and John Major) abolished it.
Now a Landlord can increase the rent by as much as they like(market forces),and the Tenanat has to apply to a Rent Tribunal for an assessment.
Of course immediately the Tenant does this the Landlord will slap a 2 month(legal) evicition notice on them, and then relet the property at the higher rent!
Talk about security of tenure.
philkool~
You say "to replace something because its old is not an improvement "
So lets say you have a Victorian range which is replaced by a modern brand new range cooker,you are saying that is not an improvement?
I think you need to look up the meanings of the words.