If you don't like the charge then don't buy the house. The charge will be part of the requirements of ownership - you can get your conveyancing lawyer to review the documents if you want further details and your lawyer would also explain the consequences of not paying the charges if you decided to go ahead and buy the property.
Homes built on some private estates will have maintenance charges to pay for things like grounds upkeep/roads upkeep etc etc. The reason for this being that if it is private land then the council won't do common area maintenance - like roadsweeping/litter cleaning/mowing the common grassy areas/road repair etc. The UK doesn't have as many of these arrangements as, for example, the United States (where such charges are frequently referred to as Homeowners Association Fees) but if you buy a freehold property on a privately owned estate then a charge like this would be normal. If you refuse to pay it then the estate would take steps to enforce the obligation to pay.
Again: unless this is a dream home of yours for some reason then just look for a different place to buy.