0001047469-03-027890 Sample Contracts

Spirent plc (the "Company") SPIRENT STOCK OPTION PLAN ("SSOP")—OPTION EXCHANGE OFFER OPTION ELECTION AGREEMENT AND PROMISE TO GRANT REPLACEMENT OPTIONS (the "Option Election Agreement") SCHEDULE OF GRANTS

Spirent PLC • August 15th, 2003 • Telephone communications (no radiotelephone) • Delaware

• Company
  Spirent PLC
• Filed
  August 15th, 2003
• Industry
  Telephone communications (no radiotelephone)
• Jurisdiction
  Delaware

Grant Date Exercise Price(£) Options Granted Options Outstanding Replacement Options to be granted, if exchanged Make ONE Election for EACH eligible grant. Check a box, like this: ý

SPIRENT plc SPIRENT STOCK OPTION PLAN STOCK OPTION AGREEMENT

Plan Stock Option Agreement • August 15th, 2003 • Spirent PLC • Telephone communications (no radiotelephone) • Delaware

• Contract Type
  Plan Stock Option Agreement
• Filed
  August 15th, 2003
• Company
  Spirent PLC
• Industry
  Telephone communications (no radiotelephone)
• Jurisdiction
  Delaware

Unless expressly provided herein, the terms defined in the Spirent Stock Option Plan (the "Plan") shall have the same defined meanings in this Stock Option Agreement (the "Option Agreement").