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Using a short extension lead on a 2.5 kW appliance is not ideal. But it shouldn't be a significant danger provided the extension is in good condition* and any other appliances plugged in are low power. Every plug and socket connection on a high power appliance has a risk of getting overheated...

10 years ago we took posession of a small house to rent out, and needed an EICR. The electrician told us that there was leakage to earth and the whole house needed re-wiring, so we were very worried about the need for major and expensive work. Then I had a careful look at the certificate and...

If you're looking inside a washing machine it can be worth squeezing the hose from drum to pump to see what it feels like. Ours felt very lumpy. Turned out not to be the cause of the fault I was chasing but the machine now drains a bit faster and I am over £30 up.

It would also make sense for the meter to tell the supplier (and maybe also the customer) when the battery is near the end of its life. Not very smart if it doesn't do that. And if it does do that, the supplier is not being very smart if they don't act on the information.

They're normally installed to prevent common mode radiation or pickup. They act mainly to add a low value inductance into the circuit. So the answer is yes, in principle. But I don't know if you can get ones that will cope with the current likely on a household supply. I would guess not.

With twin cables (with or without earth) most radiation or pickup will be common mode. That's what the ferrite beads or rings are usually there to reduce. In principle it would work on separate L & N but these things are not designed for the sort of current you will get in a household mains...

The instruction manual is available on the B&Q web site at the bottom of the product listing, excerpt below. The wiring diagram shows only three wires to be connected so either the instructions are wrong or a wire has been added. The line/neutral colours for the UK are stated to be red/black...