You need to make yourself more familiar with the legislation before you get yourself into trouble.
For your existing tenants or new tenants the most you can increase every two years is by 4%
@SarencoThat's not correct
I think we can agree the first paragraph is correct!
Re-reading my second para however & I can see it's unclear. What I was trying to say was that the existing tenants get a 2 yr rent freeze and with new tenants the 2 year clock would start again.