Thank you - this is as I thought. The position will be determined by your lease but it would be very unusual - and your solicitor should have pointed out any deivation from the following position - If the legal position in terms of your responsibilities and obligations was different to the following which would be the position provided for in the overwhelming majority of leases.
A normal residential lease would provide that freeholder landlord is responsible for maintenance of any pipes serving more than one flat and that an individual flat owner would be responsible for any length of pipe solely serving one flat and no other. In other words, Your lease very likely provides that you will be responsible for any length of pipe which connects into the communal pipework and solely serves your flat but Would not have personal responsibility or liability or the communal pipe that serves more than just your flat. The same is true of waste pipes.
If there is a leak it will be necessary to determine where the leak occured as part of the repair so as to correctly apportion liablity in terms of the costs of fixing it. Some landlords maintain Insurance policies that provide for full pipe cover and where this is the case it may be that you would not have to Personally pay For any repairs regardless of the location of a leak But where this is the case, it is likely to be a "perk" rather than a right as your lease very likely provides as above.
In terms of your rights, your lease almost certainly provides you with the right to receive water through the pipes and similarly to discharge wastewater through waste pipes and Will contain similar rights in respect of other condiments such as electricity gas and so on as applicable
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