Your current management company should be able to explain this.
But just in case they can’t, a service/maintenance charge is a charge that you are liable to pay under the terms of your lease/deed. Your solicitor should have explained the terms of your lease/deed and the obligations relating to the property upon purchase.
As of 1st January 2013 homeowners will be advised by any gas engineer that their gas boiler flue system is “at risk”, if a Gas Safe registered engineer is unable to inspect the flues especially if they are concealed and there isn’t an inspection hatch.
The reason behind this is to raise awareness of the potential dangers from certain types of flues and the risk of exposure to carbon monoxide (CO).