By the 'Project Team', I assume you mean the Client and Contractor teams.
So firstly, the Client's team should not be counted as Defined Cost as they are not employed by the Contractor as per the opening bullet points of People in the full Schedule of Cost Components.
However, for the Contractor's team, it could be argued that it is "subsistence" as per People 13(b) of both NEC3 & NEC4 ECC. However, "subsistence" implies support at a basic level so, for instance, a £100 per head slap-up meal is almost certainly over the top, but a reasonable sum would. I'll leave you to argue over what a reasonable allowance would be.