This section applies to any company to which section 690A applies.
Any process or notice required to be served on a company to which this section applies in respect of the carrying on of the business of a branch registered by it under paragraph 1 of Schedule 21A is sufficiently served if—
Where—
a document may be served on the company in respect of the carrying on of the business of the branch by leaving it at, or sending it by post to, any place of business established by the company in Great Britain.
Where a company to which this section applies has more than one branch in Great Britain, any notice or process required to be served on the company which is not required to be served in respect of the carrying on of the business of one branch rather than another shall be treated for the purposes of this section as required to be served in respect of the carrying on of the business of each of its branches.