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From screwfix if 600mm or 900mm will fit, Sylvania SylPipe https://www.screwfix.com/p/sylvania-sylpipe-300mm-led-cupboard-batten-light-4w-500lm/564vn https://www.screwfix.com/p/sylvania-sylpipe-35mm-led-cupboard-batten-light-11w-1300lm/163vn

A lot of the cost is the batteries, some of the cheaper sets look good price but look close and they have smaller batteries Also don't discount b and q, its easy to get a trade card in your employers name and when they have a tradeday buy from Trade point and get 20 percent off, the store...

It looks maybe a 13watt T5, colour warm white tube (3000k) though i think there longer at 500mm + If its 400mm then it's maybe a 13watt T4 warm white tube. The fittings these fit tend to fail before the tube, so a new tube may not even work, unlikely there's a led replacement lamp...

You should have turned the tube 90 degrees first to remove it, take the tube right out again and use the tube end to twist one at a time each one 90 degrees Then slip the tube upwards through the two slots then turn 90 degrees

Been a while, turns out back in 1992 before gridplus the mk 891 was sold as flush or surface as you say,. I had only ever used or seen them surface with metalclad fronts, these metalclad fronts at 76 x 76 fit snugly on that 73 x73 box, however not much tolerance when that box flushed in...

Its more for children with small fingers pulling out the plugs.. I remember a call out early 80s where a bloke nearly died, he plugged in a kettle and the plug blew up, he said his son gave him the kettle. On inspection there was what looked like 5 amp fuse wire wrapped between the L and N...

Is the above switch and the fuse for the same appliance, as too me the above seems like its for two appliances fridge And freezer as mentioned in your first post. Maybe im reading it wrong but (live from flex outlet into L1 fuse linked to L supply switch ) ? Wired as you say above a...

Is it to stop insects getting in

If its got unsleeved pins then its not advisable to use it

They were made foe use in floorboxes back in the day

Any adverse effects like arcing etc will be dampened by the compound

Carefully use a screwdriver on one of the 3 ridges and tap it round to start it, the heat warps the metal and makes them bind in, sometimes best to remove the fitting from the ceiling to. do it If you don't want to scratch it use a bit of wood rather than a screwdrive

Yes think so, similar to a burglar alarm pir they work on 12 volts , not always a relay i think sometimes is done with electronics components

I believe modern version all works off the 9v battery, it just somehow operates a pair of contacts rated at mains voltage

Possibly Artic flex, the yellow and blue stuff used for festoon and stuff outdoors

Surprised theres no ASBESTOS insets in them

Not all the plugs are the same regardless of the tube T4 or T5, there all 230v leads though,, a new fitting will come with the relevant mains lead, simply cut it to length and it will connect into that white box, its unlikely you will find a lead to link from an older fitting to a new fitting...

Honeywell

It's likely the red and yellow pair do the switching whilst the blue is a neutral , if so you need to be carefull where you connect the blue

No idea , will have a look next time i see him, not seen any gizmos its still wired in to an old screw terminal junction box, reason bit of both i think bit of nostalgia and of the mindset of if its not broke keep it, his wife has a mobile though. He still has old test meters with PO...