Oh well done! [Smile] It's just a case of getting your head around the difference between private renting and council housing.
Housing benefit always works by deciding how much money you need to live on (your applicable amount), how much income you have (after tax, national insurance and half of your pension contributions), and whether your income exceeds your applicable amount (this is called your EXCESS).
Once your excess is calculated, they calculate 65% of it. So, for example, if your applicable amount is £200 and your income is £300, your excess is £100, so you have to contribute £65 towards your rent.
So it doesn't matter if your rent is £500 or £800, your contribution is £65.
If your rent is £500, you'll get £435 HB and pay £65 rent.
If your rent is £800, you'll get £735 HB and pay £65 rent.
So you can see that you are no worse off, because your contribution is exactly the same. It's just that the total rent is less.