Re: I need an electrician
> If the OP was competent enough to wire up the door handle without electrocuting himself in the process, he wouldn’t need an electrician.
Unfortunately not true in the UK (at least in the last decade or so). You must have work done by a "certified electrician", even if you don't need them. Otherwise insurance companies will not insure your home. It would also complicate selling the house, because buyers nowadays want invoices and proof that any work on the property was certified, otherwise they use it as an excuse to push the price down.
Case in point was my parents house. My father (and his father) were electrical engineers, specialists in power electronics. They traveled the world installing, wiring (and sometimes rewinding) MW class generators and industrial motors, while also wiring up kV power transformation and distribution systems, mostly for hydro power stations.
Yet when it came to wiring up the new kitchen, my dad was forbidden from doing it, because he wasn't a "certified electrician". So we had to pay an electrician to wire up six spot lights, power sockets and the cooker to the mains. Needless to say my dad just followed the guy round telling him exactly how he wanted everything done, but it was still irritating having to pay someone to do a job you knew exactly how to do yourself.
While on the other hand, at a previous rental I lived in, the "certified electrician", managed to miswire the live and earth, meaning all the copper pipes in the bathroom were live. I got electrocuted a few times before I stuck a voltmeter to the pipes, and showed a photo to the landlord with 70V shown on the voltmeter display.
The only reason the full 240v didn't go through the pipes was because there most of it was still draining via a (rapidly corroding) earth spike, but it was enough to give me some nasty shocks when I would touch the taps.