Im not sure that there is much guidence on this, however if there was a clear notice stating that grippers should be screwed or glued and that the carpet fitters ignored this, then the carpet fitters a liable to rectify the problem if it is this that is causing the squeeks. The squeeks may well be due to the nails moving in the wood which screws would not do hence why they state to use them as the house will be subject to movement and shrinkage. Id write to the carpet fitters and ask why it was nailed and not screwed as per the form. State the reasons why it is important (bellways note) and ask what they intend to do to rectify the problem.
Good luck



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