Is it just me or is this book not much better written than the OSG itself? Both are very poorly laid out in my view.
Off on a tangent, seen in global context the UK does indeed seem absolutely obsessed with the fear of electrocution. Regs in other industrialised countries I have lived many years in (Belgium, Japan) are far laxer, with no apparent ill effect. Laxity of regs in the USA _with_ ill effect is well covered on the internet, but then the Americans are on a different planet!