22. London Underground has little or no leverage to secure cost-effective changes to the scope of the contracts. The Infracos have the benefits of being the sole suppliers of infrastructure services to London Underground. They have already invested in equipment and expertise and to bring in other contractors would be very expensive. At 7½ year review, if London Underground and the three infrastructure companies cannot agree a price for the restated scope of works that London Underground wants in the following period, then the matter can be referred to the arbiter. The lenders are not obliged to provide new money for new requirements and the suppliers would have to find a new source of finance in those circumstances.25
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