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    F&E Tank Overflow query

    I'd be tempted to try to turn that valve off and if it won't turn then try to turn it on and, if it moves, see if you hear water going into the tank. At end turn valve back to where it was. If you can turn it off then there's probably a float valve in the tank. If it's seized up then...
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    LED light installation

    The usual advice on here is that it's perfectly alright to add a socket onto a (pedantically) ring final as long as you are sure it IS a ring final and that the circuit is protected by an RCD (all new sockets must be RCD protected). edit: EFLI beat me to it.
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    Electric supply to a cooker hood and a GAS hob.

    But TTC is pretty accurate when he says: The "safe zones" show where you must be careful 'cos they might contain electric cables and, as others have said, you show where these zones are by having a switch or socket or one of a few other things in the wall. Living down to my moniker, arguably...
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    Phone number

    It's my, possibly faulty, memory that the GPO had their ANN (All Numbers Now) advertising campaign in the early 60s, so that label is unlikely to be less than 50 years old.
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    BT line tester

    It wasn't quite like that, for some time (many months, possibly more than a year) you could use either 0171 or 0207, equally 0181 or 0208 so within London we had to use 11 digit numbers. Then 0181 & 0171 were scrapped and 020 became the London prefix.
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    Leaky external drain pipe. Can it be ignored?

    Link: https://www.bbc.co.uk/news/uk-england-kent-57777935 Seems to be saying that Southern Water deliberately discharged raw sewage, it wasn't a case of torrential rain causing an overflow.
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    Help needed blanking a light switch

    Just being a pedant (again), sorry: I believe TTC meant "I would NOT..."
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    How dangerous is daisy chaining?

    You can get pattress boxes which convert a single socket to a double, such as (link): https://www.toolstation.com/axiom-pattress-box-conversion/p80152 Obviously you have to get a double socket as well and there's no guarantee that the current cable is long enough to fit into the double socket.
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    Using earth for dry contact switch

    At the risk of sticking my nose in where it doesn't belong. I believe:
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    Viessmann Boiler Flexible Flue System

    A while back there was this thread about which boilers the pro's on here had at home: https://www.diynot.com/diy/threads/professionals-which-brand-of-boiler-do-you-have-in-your-home.565931/
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    Blankety blank

    Deleted, as no longer relevant.
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    New Consumer Box advice please

    Nylon screws are available, e.g (link): https://uk.rs-online.com/web/c/fasteners-fixings/screws-bolts/machine-screws/?applied-dimensions=4294881404,4294474537 Obviously I'd suggest you discuss with your sparky whether (s)he'll replace the screws in your light switches as part of installing the...
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    Joint for dishwasher flex

    I'm no expert but I'd be very surprised if the box couldn't handle the heat, it's not as if it's connected to an oven. However I'd probably try to make sure it isn't touching the dishwasher.
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    Upstairs light on downstairs circuit

    I've no personal experience of this, but I've heard that, long long ago, light socket usage was covered by the standing charge so she'd have got free electricity for the ironing.
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    Earthing on Light Circuit?

    I believe (I'm not a sparky) that that includes any exposed screws, e.g. (edit) visible screws holding a faceplate on need to be plastic (possibly nylon).
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    Mystery box

    I think Harry is referring to the picture in the very first post, not to the picture that RF posted.
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    Radiator Query

    There's no absolute reason why the pipes from/to the boiler can't be tee'd off close to the boiler so that one radiator is, effectively, on its own circuit. However you might find that that radiator gets more than its fair share of hot water. As the others have said the radiator has to be on a...
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    underfloor heating - not so efficient?

    Definitely. Please don't take the numbers in this condescending description as gospel; as an explanation, draw some water from the cold water tap, now heat it up to boiling point - you've put in a "dollop" of heat. Keep on heating it until it's all evaporated - that's taken 6 more "dollops" of...
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    How to remove metal back box that's cemented in?

    Deleted as covered by other posts (I was too slow typing).
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    Extension socket advice..

    I agree the OP could have been clearer but he did say: He could well have meant "Existing socket has a spur ..."
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