While surge protection is not mandatory, it can significantly reduce the risk of damage to sensitive electronic equipment. Consider installing surge protection, especially if you have valuable electronics or live in an area prone to electrical surges.
The electrical wiring regs states:
Protection against transient overvoltages shall be provided where the consequence caused by overvoltage affects results in: Serious injury to, or loss of, human life. Interruption of public services and/or damage to cultural heritage.