However, just because unlicensed/unregistered work on gas installations and aircraft is outlawed does not necessarily mean that the same should be the case with domestic electrical work. The decision has to be made on the basis of a risk assessment in relation to each type of work.
In terms of risk, gas in most homes consists of a single appliance - the central heating boiler. Sometimes there will be a gas hob and maybe a gas fire. In any event, a very small number of items, and very little to go wrong or be tampered with.
Electricity is present in multiple locations in every room, outside, in the garage etc. It is also far more likely to injure persons, as it can't be detected without test equipment, and from the evidence on this website, most DIY persons do not even own a basic multimeter, yet seem perfectly happy to rip down light fittings and then find they have no idea where the wires should be connected.
There is the added problem of ancient and dangerous electrical installations which have not even been seen by electricians, simply because the property owners have done everything themselves.
If it is true that, pre-Part P, there were only half a dozen or so deaths per year due to 'dodgy electrical work' (some of which was probably perpetrated by electricians), the case for any LABC control of electrical work on safety grounds would seem very weak. They are probably more deaths due to falling out of bed, or falling down stairs.
There are. The number of deaths from faulty wiring is tiny. So is the number of deaths from faulty gas installations.
The real reason was to bring electrical installations in line with other notifiable services such as water, heating and gas.
Corgi (now Gas Safe) did a good job at convincing people that gas was dangerous (even if that isn't necessarily true), with the result that most people do not attempt gas work themselves. No equivalent exists for electrical work, and although there are plenty of ways to kill yourself with the electrical system in the average house, most people are happy to have a go at it anyway.
This won't change until DIY electrical work is banned.