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Friedland also do flood lights with PIR that can have a voltage on the switched live http://www.friedland.co.uk/en-GB/products/Security/Detectors/spectradectorandlights/Pages/default.aspx

As already stated you need speak to your qualified electrician. He may not be willing to sign off anybodys work other than his own. You should also read the guidenace in the approved document for PART p of the building regulations...

I presume the wall is going to be finished in plaster board or plaster. In this case I would simply fix 25mm boxes (and cable) on the surface of the bare wall. When the plaster or boading is complete then the boxes will be burried. No need to make holes in the breeze block

Do you mean you want to put voltage onto the switched live contact of the PIR, eg have a wall switch that will override the PIR? If so the SPECRA range from Friedland have this feature, you can view the instruction (wiring diagram) on this website...

I got mine from RS components.

The meter, fuse head and supply cables do not belong to you and only authorised persons (the distribution company and their agents) can work on them. Most electricians would not work the service head and meter. Any unauthorised interference with distributors property mat result in prosecution.

From the wiring regs BS7671:2008 Reg 526.5 requires that every electrical joint of a live conductor is made inside a suitable enclosure e.g a junction box Reg 526.9 requires the cores of sheathed cable are enclosed in a suitable enclosure e.g. junction box. Reg 526.6 requires that there...

To start with main equipotential bonding is required for all extraneous-conductive-parts, including the following: (i) Water installation pipes (ii) Gas installation pipes (iii) Other installation pipework and ducting (iv) Central heating and air conditioning systems (v)...

http://www.howmanylights.co.uk/

IMO you need to be looking at 7W or 8W LED replacements to get a similar light output to your 50W lamps. See these manufacturers http://www.kosnic.com http://www.halers.com/led_downlights/10765_0c.html...

It is quite a common arrangement to have a common neutral on a large lighting system. L1, L2 and L3 are connected to the single pole MCB, the 1st luminaire you connect L1 and neutral and earth, the second luminaire L2 and neutral and earth and the 3rd luminaire L3 and neutral and earth and...

Have a look at 559.6.2.3. EDIT, I think the device could simply be a linked switch rather than a 3-pole breaker?

what did they do before they had circuit breakers i.e. fuses

Kosnic ( www.kosnic.com ) and Phillips ( www.lighting.philips.co.uk ) are doing some great lamps that will be as bright as the 50W For downlights there is my favorite www.halers.com

For spot lights and downlights Kosnic ( www.kosnic.com ) and Phillips ( www.lighting.philips.co.uk ) are doing some great lamps that will be as bright as the 50W For downlights there is my favorite www.halers.com Some of the Phillips ES and BC LED lamps look interesting, I have yet to...

What kind of lamps are you referring to Are they for use in downlights, or are you talking about ones with the more traditional Bayonet caps and Edison Screw caps

As an electrician I would expect to carry out some testing to make sure the accessory is safe to use, otherwise what value do you add that the caretaker could not have done himself. This issue was covered in issue 172 of NICEIC's Connections magazine.