NEC ECC: Process to implement Clause X1 where no indices have been included?

We are currently working on a JV project which has clause X1 included in the contract documentation. We are aware that indices should be written into contract data part 1 but this has been overlooked, What is the best way to progress considering there is no information included within the contract?

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From what you say, it is clear that price adjustment for inflation is part of the contract.

So choose an indices that you like and propose it to the PM / Employer. See what they come back with !