The law states that service charges and administration charges must be 'reasonable', though the process of determining what is reasonable is generally a matter for the court.
It's worth comparing service charges of similar properties in the area or asking local estate agents if they think the service charge is reasonable.
If you dispute the charges or ground rent, the general advice is to pay first, challenge later as non-payment usually means further fees being added (late payment, debt recovery and legal fees). (i.e., what started as a dispute over £350 can escalate to £1000 if you withhold the charges.)
If you have a mortgage, an application can be made to your lender to pay the outstanding amount and add it to the mortgage. (For which the lender will usually charge a fee, of course.)
If the charges are still unpaid, proceedings to forfeit the lease and take possession of the flat can be started.
It can be difficult to challenge charges which you have previously accepted and agreed to pay. (you need to make it known at the time of payment that you dispute the charges.)
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In general, the service charge at Benedicts Wharf has been in line with similar developments in the area. The shared heating and hot water system means an increase in service charges with the current high energy costs faced by every household in the UK right now.
Where flats are rented out, it can be hard for the leaseholder to pass on this increased energy cost to their tenant via their rent, instead of the tenant paying only for what they use directly to the utility company.
If there was a boiler in the flat itself, the leaseholder would have to pay for annual safety checks and maintenance. With the shared heating and hot water, the cost of maintaining the system is paid via the service charge instead.