More fundamental point is that there is no such thing as a verbal instruction, and no such thing as a CVI. If the Contractor is asking them to do something that is different to the Works Information then they should instruct the Subcontractor in writing. If they don't do this - then don't do the work. Clause 20.1 obligates you to do the work in accordance with the Works Information - so to do anything else could result in a defect. l
So you should have an instruction as to what the Contractor wants (or wanted) you to do, you should notify this is a CE (if they don't) and then you can claim anything the Shorter Schedule of Cost Components says you can claim for.
So you should have an instruction as to what the Contractor wants (or wanted) you to do, you should notify this is a CE (if they don't) and then you can claim anything the Shorter Schedule of Cost Components says you can claim for.