Thanks for your question.
Do you want to know how whether you can terminate your tenancy, or how to compel the Landlord to make the repairs?
You are liable to pay the rent until you legally terminate the tenancy, it is a separate obligation to the landlord's obligation to provide a property in reasonable repair. You can terminate the tenancy if the property is unfit for human habitation because this is a breach of the landlord's obligations that is so fundemental it entitles you to treat the contract as at an end.
If you intend to terminate based on uninhabitability then the safest way forward is to request an officer of the environmental health departments make an investigation of the property. If they find that it is unfit for human habitation then you can ask them to either make a declaration of this and give you a copy or otherwise give you a written acknowledgement of uninhabitability. You can then use this as evidence to terminate the contract. You may wish to also document the problems with the repair by using photographs just in case.
Your other housemates can stay even if you terminate for uninhabitability and will be liable for the rent until they terminate (and so will their guarantors).
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