Can an instruction to change the Works Information (for example a drawing revision, requests by the PM to add/ omit works) be issued through General Communications or Early Warnings? Or indeed email? I note the Northern Ireland Housing Executive v Healthy Buildings (Ireland) Limited case where a minute from a meeting was deemed as an instruction and a subsequent Compensation Event occurred.
Provided the communication complies with the requirements of clause 13, then it would be a valid instruction. There have been other posts on this subject recently which you can find in a search.
If the instruction changes the Works Information then the Project Manager is also obliged to notify the matter as a compensation event, or, if the PM fails to do so, the Contractor should notify accordingly.