Hi, my mum has rented a property for over 30 years. Her rent for the last 10 years has been below average at £700. However, for most of that she put up with rotten wooden window frames do more! The landlord had to replace these and upgrade to central heating to comply with energy performance laws. She has just received notification it will be increasing over£1000 pcm from November. Is this legal or is there a cap per year it can increase? TiA