(a) its merger with, consolidation into, or acquisition of or by, any other body corporate, firm or business; or
(b) any purchase, assignment, transfer, pledge, or sale, of any assets or shares, occasioning any gain or loss by any person (or group of connected persons) of the entitlement to exercise (or control the exercise of) 10% or more of the voting power of any one Insured; or
(c) its establishment of any new office which either fails to meet the level of security declared in the proposal or causes an increase of more than 10% in the total number of employees,
within thirty (30) days of the effective date thereof, and shall provide promptly upon request such further information as Insurers may require, and shall thence pay to Insurers such additional premium as they may require in respect of this insurance. If the Insured shall fail to give Insurers any such notice or information, this Policy shall be deemed cancelled forthwith upon receipt of notice of such cancellation given by or on behalf of Insurers and sent by recorded delivery to the Insured, who shall thence be entitled to the return of a proportionate part of the premium in respect of the unexpired period of insurance.