Leasehold flats with less than 70 years remaining on the lease will face difficulties in securing a mortgage, negatively impacting their resale value and the amount of money obtainable.
"if that lease term or the number of years left on the lease goes below 70 years it's hard to then get a mortgage on it so if you're looking to sell it that will impact who can buy your place and consequently it will impact the property's value and the amount of money you can get for it"