sixwheeledbeast

I assumed standard practice for CR's. After a number of 18-23 month failures you realise it's not worth testing them.

It's 20 years old and most likely never been serviced in years get the system decommissioned or upgraded.

A shed full of servers will do then?

This is a fair point who wires plug tops to there new goods any more. The difference I suppose is isolation and competence, plugged in equipment can be isolated easily and without being competent. Arguments aside did you not get your answers to your three questions in post 2?

0.75mm flex is rated to 6A.

So you reading PM's now or not

Follow the manufacturers instructions and choose the best position with that as a guide. Post 2 was generic so advise would be the same upstairs.

You need to contact your installer.

It's double NAT'ed by the sounds of things. If this is the case there are a few ways to resolve. Remove NAT from one device. Correctly configure the NAT to stagger through the deivces. Or worse case option is to DMZ the first NAT device (useful to check for double NAT)

If red is radiators then SW would not be facing windows from your diagram. However, I did say that the plan doesn't help. They cover 90 degree so it can be a waste in flat.

Facing away but across any windows would be best. Both to reduce the chance of sunlight issues and cover the potential break in points better. Adjacent a radiator could be an issue whereas facing one on a wall opposite would be less so. You could also fit DT's instead if there are concerns with FA's The plan doesn't give the full picture but SW corners?

Use what the manufacturers recommend. I agree, would use Belden for RS485, that's what it's designed for.

Cost hight? Definitely biased

never installed one but it sounds like something that should be in the user guide.

Sometimes the weight issue is more to do with how balanced the drill is. If the battery is at the front it can feel twice as heavy as others.

I always thought the best location was the bin, myself.

Yep, there's a HD camera mod. With it's WiFi and small housing you will only have to worry about powering it.

RPi?

VPN's also have vulnerabilities as you say. Ports are there for hosting applications. In the future v6 will probably replace the need for NAT anyway. I do agree devices aren't open enough to know about any vulnerabilities. When they sell there kit there not interested in patching like the rest of the IT world, they move on. I think more needs to be done from the manufacturers end. Here's that blog

Contact the ICO to see what they recommend? There needs to be a secure method of transferring the footage IMO.

Risks are unsecure devices rather than the act of port forwarding. The equipment would need to adapted by having random default passwords for example. I recall a blog on this very topic by Joe a while back.

https://en.wikipedia.org/wiki/Series_and_parallel_circuits

They are free, Apple and Android.

Your looking at kit that the installers you have quotes from may have never fitted. If you are really unsure from what we have said so far, the only other things I can think of is:- Mesh, Texecom is Mesh based this maybe a good thing or it maybe a not so good thing. Generally you need more devices to increase signal security, with the idea that devices talk to each other not just to the controls. In a normal house the mesh will make little difference either should work fine. Range of devices, I know that Texecom has a large range of kit from Outdoor PIR's, DT's, Smokes, PA's .... As for others I don't know them well enough to comment on there range of kit.

The usual advice is get at least three quotes from approved companies. Choose the one you feel comfortable with and suits your needs, not necessarily the cheapest. Have you also compared warranty periods, maintenance procedures and service costs?