In seriousness skido6, don't do it.
What I suggest is become an electrician it's faster to do, cheaper by miles and an absolute doddle. I just got 16th edition last week, I was up against three guys who are time served sparkies with 10 some 20 years behind them, they had various qualifications on the job but needed to go further. Though it was their trade their trade experience was such a small segment of the job they had no useful experience for household work.
Every mock test I did in about 10 minutes and got a huge percentage right. They never finished the paper. Final exam i walked out after 25 minutes of the 120 minutes allowed. Without even opening the books I got easily 90% right. You only need 51% to pass.
I'm not saying this to brag but to blast some myths. If you can build houses, you should also be at my level.
Now to find your route in would take you further investigation, but because of the government part P situation there is a route in for kitchen fitters plumbers and the like. You could legitimately get in via this route as a property developer who fits his own kitchens and bathrooms. To do this you need part P qualification. So you go away for a week and get that. Now you are qualified to do almost anything and test and inspect your own work.
Next level go and sail through c&g 2381 (16th ed), after part p you'll be twiddling your thumbs waiting for the instructer to say something challenging.
Final level c&g 2391 (Full inspection and testing). That one is difficult, very very hard. It's closed book and I looked at a paper, but couldn't get the 71% (average expected pass mark, but it does depend how the other candidates around the country do, on average only 30% of electricians pass this first time).
You will have to watch this space though, because I went down to Napit to join them full scope and they ran me through the mill for two days. I mean this "trade test" was probably the toughest two days of examination under the microscope I have head in my life. At the end the examiner said yes we'll have you, that was 2391. Now what I think that meant was a trade test to the standard of 2391 but probably still need to do the c&g exam. However he said an external qualification would arrive in the post, so whatever the trade test was it was externally ratified, and just maybe napit have gained approval to run c&g 2391. Time will tell. He did say it was 2391, but many people are telling me that it can't be.
Now as for why I advise you to take this route, it's all similar work, lifting floorboards and routing things around a house.
For the inspecting side I believe it is better payed that corgi work. Lets put it like this, I did a gas inspection for a landlady prospectively buying a house, I took two hours so I could take fire front off inspect flue and back boiler properly, took other fire out to do same, checked cooker and wall heater. Found out why heating didn't work and got it going, did tightness test. made sure ventilation was satisfactory, even checked in loft for condition of feathers.
The sparks was there same amount of time as me, and took off a couple of socket fronts but that's all, did his tests at the Distribution Board.
My bill? £60
His bill? £250
The guest house I stayed in down at Napit, had recently been inspected for insurance requirements. They took a whole day toi do it and took every socket front off, but for that they charged £800.