You can only "claim a CE" against a Contractor if it is a valid reason within clause 60.1 - which I do not see this as a reason. In fact the only CE the Project Manager can really notify in order to recover cost would be 60.1(17) where an assumption is corrected in their favour.
If this requirement had been a Key Date (rather than a date that is key) within contract data part 1 - i.e. commissioning documentation has to be issued by a certain date, then under 25.3 you could claim any resultant cost that has been incurred as a result of them missing this date.
If you have certified Completion, then this could be a classified as a defect that they would be obliged to correct and if they don't you could charge them the cost of doing this as the Employer.
At the end of the day I suspect this is something that you have done to keep the project moving but not necessarily something you can contractually pin on the Contractor. However, they are certainly not doing themselves any favors what so ever and you might be able to get them back (contractually of course) in other ways! You felt the need to do these elements for them to keep the project moving. However had you not done it and they then were late, you obviously would/could have charged then Delay Damages under X7.
Sorry if not the answer you are looking for - but as most answers the answer is what ever the contract says - and this is what I think it does (or doesnt) say.
If this requirement had been a Key Date (rather than a date that is key) within contract data part 1 - i.e. commissioning documentation has to be issued by a certain date, then under 25.3 you could claim any resultant cost that has been incurred as a result of them missing this date.
If you have certified Completion, then this could be a classified as a defect that they would be obliged to correct and if they don't you could charge them the cost of doing this as the Employer.
At the end of the day I suspect this is something that you have done to keep the project moving but not necessarily something you can contractually pin on the Contractor. However, they are certainly not doing themselves any favors what so ever and you might be able to get them back (contractually of course) in other ways! You felt the need to do these elements for them to keep the project moving. However had you not done it and they then were late, you obviously would/could have charged then Delay Damages under X7.
Sorry if not the answer you are looking for - but as most answers the answer is what ever the contract says - and this is what I think it does (or doesnt) say.