I know this is going to sound harsh, but I would suggest that if you find something simple like 2 way switching is complicated, that you might want to think about a different career.
An EICR is a report on the state of the installation, at the time the report was done. Any repairs needed will need a separate certificate. Either a minor works or an EIC, referencing the EICR that the work corrected. He should issue the EICR then it's up to you if you want the work done, and...
https://www.amazon.co.uk/Status-6-inch-Ceiling-Pendant-Lampholder/dp/B007K7I1G6/ref=sr_1_7?ie=UTF8&qid=1521412865&sr=8-7&keywords=pendant you need one of these. turn the power off and take photos of existing wiring before you remove the old one.
I have just recently fitted some of these in a kitchen. Ansell Lighting - http://www.anselluk.com/en/product/AFRLED I had given the client the Ansell catalogue to pick outdoor lighting and they decided they wanted these for the kitchen. 4 of them do a surprisingly good job of lighting a small...
I have a Martindale TEC 100 that went through the wash. removed battery and dryed it out and it still works!!
Currently waiting on a new one as although I've tested it around the house I don't trust it. (not that you should trust them. but good for an indication)
try amazon they seem to have them. www.amazon.co.uk/Salus-RT500RF-Programmable-Frequency-Thermostat/dp/B003ERP1LE/ref=sr_1_1?ie=UTF8&qid=1517746598&sr=8-1&keywords=Salus+RT500RF not sure if you can get the seperate parts or neet to buy as a set.
I've never seen sand, but ash deafening ceilings is very common around here. Various loft insulation materials include blue/pink polystyrene beads, and stuff that looks like dried paper mache thats been shreded. also we have straw walls (known as stramit), and walls made of honey comb card...
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