Contingency Sums Option A NEC4

I am dealing with an NEC4 option A where the contractor has included a price in their contract at tender stage for contingency sums. This has further been broken down into general terms like heating and thermal store with sums next to the same, but no further detail.

I am having difficulty determining how such items would be paid, as it does not seem to fit the definition for Price for Work Done to Date. Would this require resolution under clause 17.1?

The Contractor has raised a CE event. Could it be argued that the contingency sum should be utilised for payment of the CE event if for example in related to thermal store, as this has not been sufficiently defined or does this have to be treated completely separately under the contract.

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