In the UK, a tenant lives in a flying freehold, i.e., the tenant's upstairs bathroom is on top of the neighbour's living room.
The tenant upstairs has admitted to forgetting about running a bath, and has completely flooded the bathroom.
Water has then gone through the floorboards and has leaked into the neighbour's ceiling, causing water damage.
Who is responsible for repairing the ceiling, the landlord of the upstairs flat, or the negligent tenant?
If the tenant is responsible, are there any special circumstances where the landlord is in fact responsible?