Does anyone have a leasehold house, maisonette or flat where they pay ground rent linked to inflation. If so, can you tell me if the lease states the index of inflation that will be used to calculate the ground rent (e.g. retail prices index or consumer price index). I ask because in my lease, it says the annual inflation should be that deemed by the 'Authority of her Majestys government' in the preceeding year. In my mind, that should be the consumer price index (since it is what the Government mostly use these days). The Landlord relies on the Retail Price Index, but it is not referenced in the lease anywhere to state they can use this older model.