Leasehold and Freehold Reform Bill

My constituent is in a flat with a ground rent of £454 a year. As that is over the £250 threshold, it means that their property can be taken away from them if they fail to pay their ground rent. As a result, my constituent has failed to sell their property six times, even though they have had buyers. They are stuck in this flat, and they cannot get on with their life. Will the Minister please look at this threshold, which is causing real problems?