As a Landlord and ex lead tenant make sure you advise your landlord that your will be the 'Lead Tenant' and you will be subbing.
What it means in reality is that as the 'Lead tenant' you are responsible for everything, paying all the rent, the bills, and keeping the property running, down to the smoke alarm batteries.
You will need to ensure you have enough cash in the bank to cover 'void periods' so that if one of your rooms is empty for a couple of months, that does not force you to move out.
What you can change is about 15% more than the cost, so a 3 bed house at £1000 PCM (so the costs are £333 per room PCM) you could add about £45 PCM to bring it to about £380 PCM + bills, but see what is being changed in the local area, You need to stay on the right side, if you overcharge then your flatmates will move out, if you undercharge you are liable to get some oddball tenants
You need to ensure your tenants don't know exactly how much you are paying, otherwise this will cause arguments
You also need to write up (and I mean "write") down some rules, such as who pays for the milk and well as how you pay for the leki, cable TV, and everything else
Also don't forget the deposit, which is liable to be about one and half's month rent.
You can not legally hold deposits from your tenants unless you are a registered with a deposit scheme (as most landlords and agencies will be)
Therefore the issue of damage or cleaning issues at the end of the tenancy will be down to you personally.
In short, with a big enough property it can be a way of living fairly cheaply, however don't think for one second that its risk free, 'cos it ain't !