No, people who's normal place of working is outside the Working Areas are only paid for when they are within the Working Areas. The distinction is provided so people who are visiting Working Areas are only paid for when they are in the Working Areas.
If the Contractor wants paying for these people whilst they are working at head office then he should submit a proposal for adding the head office (or a defined area within the head office) to the Working Areas under clause 15.1.
The PM needs to consider this proposal in detail before accepting it though as this opens the door to any item in the SCC being paid as Defined Cost where it is referred to in the SCC along with the term "within the Working Areas". There will be other impacts too, suggest you look at page 89 of the ECC as the index cites 16 clauses in the ECC that refer to the term Working Areas.
If the Contractor wants paying for these people whilst they are working at head office then he should submit a proposal for adding the head office (or a defined area within the head office) to the Working Areas under clause 15.1.
The PM needs to consider this proposal in detail before accepting it though as this opens the door to any item in the SCC being paid as Defined Cost where it is referred to in the SCC along with the term "within the Working Areas". There will be other impacts too, suggest you look at page 89 of the ECC as the index cites 16 clauses in the ECC that refer to the term Working Areas.