2.25 Just under 80 per cent of the unitary payment is fixed in German marks in nominal terms, subject to satisfactory performance over the 30 years of the contract, if the Embassy is made available to the FCO to use. The remaining portion of the payment is subject to amendment each year depending upon the change in a German price index and can also vary according to Arteos's performance.
2.26 The FCO has therefore transferred inflation risk to Arteos with regard to the availability element of the payment. In addition to the portion of the payment subject to indexation, a number of facilities management services such as cleaning, porterage, mail, stores and reprographics are subject to market-testing every three years.