I’m trapped in my leasehold property by ever-doubling ground rent

I am a homeowner trapped in a leasehold property which seems unsaleable. When I bought the 11-year-old flat five years ago I was unaware of a clause in the contract which allows the ground rent to double every 10 years. It was £250 when I moved in and has since risen to £500. In another nine years it will be £1,000 and then no one will want to buy it. AC, Coventry

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