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Yes you can, subject to the technical details of having the right driver (voltage and power), connectors or soldering. You can connect cut strips end-to-end from the same single power supply, but better to run separate wiring to each piece. Or multiple power supplies, depending on how you need...

Pretty though :)

67mm is tight. Is 70mm OK? I've seen short bulbs almost like a golfball, slightly fatter than a candle. Fridge bulbs are less than 67mm :) Usually small screw base though and maybe not quite 40W.

What a load of tosh. Just because the eco-maniacs and green quangos talk crap, doesn't mean you have to join in.

Cat 5 cable can carry the current for a short strip of LEDs, but it is cutting it fine in terms of voltage drop which leads to dimmer lights and wasted electricity. For anything more than a few inches I'd use a thicker wire (I'd use a thicker wire anyway!). It shouldn't be a fire risk though...

The quick fix has been described several times. Get the return temperature below 57C, and ideally the flow temperature also. This is the way to get maximum condensing inside the boiler. We already know that the temperature differential in your system is quite low so you'll need to drop the flow...

A pulse width modulated power supply is a switched mode power supply :) The difference is that instead of each half of the AC waveform being converted to a 50% square wave (internally), the PWMPS can supply less than a 50% square wave. This allows for tight regulation of the rail voltage under...

I don't think the light will be too intense with the frosted covers. Less than traditional bulbs and comparable to fluorescent tubes with a diffuser. Your eyes are well adapted to ignore bright light sources above eye-level. There are two issues with heatsinking of LED strips, one is the...

If you don't have a cover then you may be able to see the SMDs directly. This is very unpleasant, not just because they are tiny intense dots of light, but because they will appear to have different brightnesses and colours depending on the precise angle they are viewed from. The flexible strips...

Certainly possible. The difficulties are mainly practical. Cheap strips are very iffy, good ones are likely to be expensive. The ones you'll find in places like B&Q are essentially useless, so you'll have to go online. As mentioned, not especially efficient, but still on a par with many...

The frost stat on the boiler is a remote possibility, just because of how long it takes for these things to cool down. My boiler is in an integrated garage, the part of the house it is attached to is unheated, and I don't think the frost stat has ever kicked in. I'm going with the interference...

There are already some LED lamps designed to run directly from ELV DC, in some cases only from DC. These tend to be based around the G4/G5.3/G9 pin bases. Plenty of vehicles and boats running lights essentially from a battery source, but I don't see it catching on for most homes any time soon...

No clock on mine :)

I suspect a typo, "now" should be "not"?

Most of the ones I see have sockets hidden inside the chimney. It is arguable whether this counts as accessible or not, although the chimney can be removed quite easily if you know what's going on. I've also seen some with a socket outside the chimney, and even one wired to an FCU outside the...

On the plus side, you've got your electricity bill way down and you have one very warm cupboard :)

Sounds a lot to me, for the usage you quote. 25p/shower (for gas boiler, heating only, not the cost of the water) is a good starting point, which would be 50p/day. You might have very long showers, there might be other hot water uses you haven't listed, you might have a very inefficient boiler...

Either way would be slightly weird for a fitting with LED lamps, but definitely could be they just took an old halogen spot light and shoved LED lamps in it. If so, you at least have the benefit of it being the retailers responsibility if there are compatibility problems, buzzing, flickering...

Does your LED mirror have its own light switch. Is that what you're asking, whether this can work with the light switch on or off? If that's what you want then you wouldn't wire it through the light switch with the rest of the lights. You'd want a separate fused spur either direct from the light...

I like those too. Perhaps considered boring and old-fashioned, but there's a lot to be said for light fittings that actually light a room. The OP has perhaps already found that even directable spots don't do a brilliant job of this? Downlight spots even less so. Consider floods if you really...