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I think that is a Wickes 'own brand' one about 20 yrs ago. I've just replaced one on my own system that was leaking around the pin.

My local park this morning .... (edited to fix a bad upload)

A ~200W SMPSU, the initial in-rush to fill that capacitor would be alot more than 2A. I wouldn't be surprised to find its in the order 50A for a few mS.

Nope. You have gotten a little confused with the calculations. You are right that 180W @ 24V is 7.5A BUT ... it is the power which is the constant..... so 180W @ 230V = 0.78A (ignoring losses & assuming your 230V to 24V converting widget is 100% efficient.... which it wont be.... but 0.8A will...

From the second & third digits of the serial number? I'll have to go look at our Sangamo meter...

Another good one must the the myth about not using the armour of SWA as the CPC or the cutting back of the outer sheath of SWA to fit a BS951 clamp onto the armour....

Not so much 'old'. Its still perfectly acceptable to use threaded steel conduit & trunking systems as the CPC even on new work (with certain provisos like link wires between socket boxes & socket fronts, as well as bridging straps across trunking joins & THREADed steel conduit not slip joints)...

I think you may need to do a little reconfiguration. If you disconnect the incoming BT pair & replace with the two wires coming from the router, the master socket will generate the bell ring wire & all should be well.

All of the RJ11 phones connectors I've ever seen have been 2 wire. Never seen the third, bell ring, wire implemented on a RJ11 - I guess the phone derives the bell ring internally.

Its not American, its AUSTRALIAN. The Oz plug is like the US one but has the blades twisted. Australia uses the same system that we do.... 240V 50Hz. So you could cut the plug off & fit a UK one. However, I am suspicious that most the that rating plate is in Chinese but claims a CE mark (which...

The 'black thing' buried in the ceiling looks likes a conduit BESA box to me?

Yes, On the switch you wish to be 1-way..... just connect to the 'COM' & 'L1' terminals. leave the 'L2' terminal unconnected.

That router only has 10/100 Mbps ports! You need one with 1 Gbps if you want full throttle :-)

But, in this case, it doesn't matter. The device doesn't use the line-line voltage (since, if it did joining L1 & L2 together wouldn't be an option) so from either system (3 phase or split phase) the phase to neutral voltage is still 230V. The only thing which changes is the current in the...

Not sure I've ever seen a cable that has a current rating on it...... number of cores & cross-section - yes. Voltage rating - yes... but never a current rating. I read 450/750V rating & its type H07RNF. Where do you see a current rating?

Hmmmm... but that could lead to the neutral being overloaded (since there will be no cancellation between L1 & L2) What cross-section is the flex?

Well yes, kind of & no. Solar installations feeding into the grid do cause a local rise in voltage but not because they are delivering a higher voltage than the mains (thats not how they work. This is AC land & things behave a little different from the DC case. There are other ways to push...

As EFLImpudence correctly states, It is good practice to connect unused conductors to earth.

I guess it could be a take on the "Willis" immersion heater? The electric showers of the day were only around 4 - 5 kW so, with two (3kW?) immersions it would have had an impressive 6kW capacity - it could have been an early 'instantaneous' water heater.

So thats raised my curiosity.... How do they change the ECV on alive gas service? I doubt they are gonna turn off the gas to the whole street considering all the fuss to purge all the lines & relight all pilots etc.....so how is it done?