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I would suggest your electrician is taking the piss.
a) 18th came in Jan 2019. They should be holding a C&G Cert to say they have passed already.
b) BS7671 534 is the area of surge protection. Single dwelling (domestic) units require surge protection in high lightning strike areas and/or value and equipment of installation.
Lightning in the UK is highest in the tip of SE England and lessens as you move toward NW Scotland as a general rule.
Mr_Sworld
Apparently it's part of new regs coming in this year