SMP may well be right but it's important to know whether the property is 'officially' an HMO. If it's recognised as such, the LANDLORD (rather than any of the tenants) is responsible for paying the Council Tax. However, for that to be the case, individual rooms would have to be let to specified individuals with separate tenancy agreements rather than the whole accommodation being let to a group of joint tenants.
It's more likely that the property is not (legally) an HMO. In which case the council will send the bill to the only person who is required to pay the tax. The others who live in the house might agree to contribute towards payment of the Council Tax (particularly if failure to do so would result in the other person leaving and increasing their share of the rent) but they're not obliged to do so.
http://www.bournemout...ltiple_Occupation.asp
Chris