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About 40Ω for a 100w 230v lamp.

Assuming you mean 5ft 58w it ought to be sufficient for general use. That is without going too technical i.e. colour of walls, ceiling, height, particular usage and so on.

Maybe worth having your wheel ballances checked too, they can cause this issue.

It could just be the amount of crap in the exhaust system with it running rich. Probably just needed the Italian tune up.

I'd still have some sort of double poled isolation for it indoors for the time when it goes wrong and starts tripping the RCD. 13A fused spur unit will suffice.

Your contradicting information may come from older sources when it was notifiable, currently it isn't in England. Even though it isn't notifiable it still needs to comply with the building regs, i.e. it has to be safe. When you say it is a spur from a socket in 13A flex, that strikes me as not...

A few ohms of wire isn't going to make much difference to a 10K detector.

Same thing happens when you put some SON I lamps in fittings with external ignitors.

Have you made sure the tamper switch is closed on the door sensor you moved? There are default codes listed in the installation manual but these have probably been changed: https://www.tlc-direct.co.uk/Technical/DataSheets/ESP_Prime/prime_instalations_EL206186.pdf

It depends how it was installed. From what I remember the bezel around the outside of the vent turns and comes off revealing screws which attach to some arms that swing out. If you can get them to retract it ought to pull down and hopefully you should be able to detach it from the duct, push...

They aren't worth repairing, new ones are cheap. assuming a single 50w 12v halogen lamp this will do http://www.screwfix.com/p/halolite-electronic-transformer-loop-in-loop-out-large-terminal-20-60va/63579

Don't be surprised if the ignitor has welded it's contacts together.

More likely there is a loose connection in the switch which is causing it to heat up. From that code it is probably 6mm with a 2.5mm earth but without seeing it myself that is only a guess. If the switch has gone toasty it will probably mean making off the cable again. My advice to is not to...

One that always puzzled me is the link between a transformer and a sub station, the setups I have seen are in what appears to be 4x single core armoured cables, probably in the region of 250mm^2 each.

The plastic bit pushes up to allow access to the two spare f-types. Once connected pull it back down.

No, put the rose back as it was and put the two wires in the same terminal in the switch.

I doubt it will be a faulty rose, the switch may be faulty.

Like most things, if we follow the guidance we have a good chance of complying with the law. In this case the statutory instrument is the DPA (data protection act) which if you are using CCTV which films images of the street or anyone elses property you need to comply with.

Wouldn't it need bonding to the MET too as it is introducing an earth potential into the equipotential zone?

Have a read of this first: https://www.gov.uk/government/publications/domestic-cctv-using-cctv-systems-on-your-property/domestic-cctv-using-cctv-systems-on-your-property