If you buy your flat or maisonette from the council, you become a leaseholder. This means that while you own the property, the council continues to own the freehold.
The council remains responsible for the maintenance of the structure and communal parts of the block of flats or maisonettes. Under the terms of your lease, you are required to pay service charges towards these costs and any major works contracts that are carried out.
Comprehensive information and guidance for leaseholders is available in the leaseholders handbook [pdf] 561KB.