Coincidence maybe. But many extension leads are incredibly flimsy and most aren't up to continuous high loads - both in terms of cable thickness and rubbish socket contacts. High continuous load on a cheap extension lead is a fire waiting to happen.
It's 90% certain that there is an earth in your existing bulkhead light, just that the adaptor you've identified is not the way to make the connection. A direct connection between your security lamp flex and the incoming cable in the bulkhead lamp would be the correct way to proceed... And that...
It's suitable for connecting the flex of a double insulated (class 2) low power appliance in an appropriate environment. Can't see why you'd want to use it for your outside light. Seems a bit of a bodge, why not install it properly? Most pir floods are class 1 needing an earth anyway, so this...
Yes, the brake mechanism needs to be fully functional for the breakaway cable to work correctly. Any chance of a picture of the lower end of the brake lever.
Working in a university fabrication workshop today, and they've got an unusual bench shear or notching machine. With a lever mechanism similar to a typical bench shear, but the blade descends between two edges so rather than a normal shearing action it takes out a strip of waste maybe 4mm wide...
(Hot?) rolled steel sections with welds at the corners. The 1950s era windows were made with special section material so it was only the corners, hinge and catch fixings which needed welding - presumably an electric weld process. Frames I have seen were galvanised after assembly. Whether this...
Not suggesting a hard bonding agent like epoxy, but a resilient sealant/bonding agent. Remember most fixed glazing on cars, including windscreens, is bonded in place.
What's wrong with bonding glass into an angle iron frame? Quite a common 'industrial chic' technique especially with wired glass in a blackened steel frame, and avoids the complication of trying to fabricate a glazing channel. Adds to the structural strength of the door too.
Check out the current requirements for building regs part p notification. AFAIK if you're not changing the consumer unit and you aren't adding whole new circuits or doing any work on bathroom electrics then most other stuff is open to any competent person to do.