Small point of detail - but there is no Zone 3 anymore! There are three zones but they are Zone 0, Zone 1 & Zone 2.
The law still refers to the 16th edition of the regs in the description of a special location hence even though it is not referred to in the 17th edition regs, any work in zone 3 (16th ed'n regs) is notifiable, even if working to the 17th edition.
Confused?
