The letting agent has called me to say tne tenant has called about a maintenance issue, the bathroon sink is blocked. I told the agent that I didn't really consider it a landlords maintence issue, until the tenant, who probably blocked it through the usual hair and fluff that falls into sink, has tried to unblock it using chemical sink unblocker and if that hasn't worked then yes it would need looking into. Am I on the right lines or not here?