What to assemble before a variation is priced
Before a variation is priced, the documents that actually matter are few:
The executed contract, so the variation clause, notice clause, and valuation rules can be read as they stand — not as they are remembered.
The instruction or event said to change the work, in the form it was given.
The notice, if one was required, with the date it was given.
The extracts from the priced document that are said to supply the rates.
The programme and delay records that are said to support any time.
A review that skips that order tends to argue the money first and discover later that the work was not a change, or that notice was late, or that the rate never applied. Putting the papers in that sequence does not decide the claim. It shows what the claim is actually made of.