A number of things here :
- an instruction to do work (as a change to the Works Information) is a separate thing from a compensation events progress through the CE procedure i.e. getting on and doing the work or making a decision is separate, albeit related, thing from its implementation of the CE ;
- consequently, the Contractor "asking" is exactly that as the timescales of the compensation event apply, although ideally well-beaten
- if the Contractor refuses to do the work until the PM has accepted the quotation, but the Works Information has been changed, the Contractor is potentially not only in breach of contract, they are breach of their general contract law duty to mitigate and, in the eventual assessment, may well be contractually entitled to less as they are not acting competently and promptly etc. in accordance with clause 63.7.