jack

We really need one of those emojis where the head actually rolls as it laughs.

Sure, but no-ones disputing that changes in air density/temperature cause changes in power output. That's notoriously well known to anyone who's read car mags for any length of time, or been involved with flying planes However, everything I've read says that the proportion of oxygen doesn't change much out of doors anywhere on the planet. I can't find anything to support the idea that as soon as you move from a built-up area to the country the oxygen level consistently increases 2-3% as you suggest. I'm not questioning what you've seen, but there could well be all sorts of other factors involved.

But there isn't going to be a 2-3% difference in oxygen levels between places in the UK. It's more likely to do with machine calibration.

I just leave it overnight and drain it in the morning. No idea what temp it reaches but I'm sure most of the temperature difference is captured this way. Life's too short to think any harder about it than that!

Interesting. That's one of those weird double-think moments where I held two opposing pieces of knowledge at the same time without realising the contradiction!

On the odd occasion we use a bath during the heating season, the water is left to go cold before draining.

Welcome!

Oxygen levels outside are more a function of altitude than country v city. Of course, cities have other components floating around that are less of an issue in the country (although those with certain allergies may disagree!) MVHR can absolutely make a difference to air quality, especially in relation to CO2 levels (which affect perceived air freshness far more than the O2 level). Re: per room temperatures, I don't zone our downstairs UFH. There's just one thermostat and that controls the whole house. However, you can set up the flow rates per room so that, say, the kitchen is cooler than the living room (or however you like it). Less flexible, sure, but has the big benefit of simplicity, with only a single thermostat and no need for per-loop controls. I haven't bothered, as I'm perfectly happy with it running with all loops wide open.

Yes, that's the stuff. I've been looking into it for my garage but I think it's going to be too expensive.

Thin layer of self-leveling topper perhaps? Not cheap but neither is grinding.

Ah yes, the skin effect. Beloved pseudo-scientific explanation of audiophiles who believe spending thousands on interconnects or (worse) power cables with the same resistance, capacitance and inductance as the components they're replacing will somehow "lift a veil" off the sound of your system. From memory, the contribution of the skin effect even at thousands of kHz is negligible.

I don't think battery storage is worth it with 2.5kW of PV. I'd pay the £7k and get a grid connection.

My only thought is that I don't have sufficient knowledge about any of this to give you advice - sorry! ?

Just as a point of comparison, we have 8.5kW of PV and there are often days in a row in winter where we generate sod-all power. Generator backup will help your electricity needs, but it's an expensive and inefficient way of heating water. Could you add oil or bottled gas to supplement your water heating needs when the sun doesn't shine?

While I agree with most of what's been said in this thread, as I understand it this isn't what these companies do (at least in terms of what they say they do, and I'm not aware that anyone has yet detected transmission of audio when it isn't supposed to be being transmitted). I understand that they buffer audio locally and continually scan for an initiation phrase ("Okay Google", "Alexa", or whatever). When the phrase is detected, the audio from just before that phrase, and for some time afterwards, is streamed to their servers where speech recognition is applied. It's that audio that's stored. I'll admit that I don't know how long this streaming goes on for - you'd hope just long enough to identify a valid request. In the case you reference above, the police were not expecting evidence in the form of general conversation throughout the evening, or the sounds of the murder. They were hoping for incriminating search terms, and even better the audio of a voice requesting an incriminating search. I can imagine that this could be powerful evidence if it existed, because unlike a keyboard search, there's no question who was involved (there were several people in the house the night of the death I believe you're referring to). Of course, whether big companies can be trusted to do only what they say they'll do is another question. In some ways I trust very big companies more, because it's harder to keep a secret when you're massive and there are potentially hundreds of people involved in any particular project. For example, I believe Google is being looked at at the moment to see whether they continued location tracking when users turned that feature off. That said, I won't have one of these devices anywhere near me, despite how useful they are. Worse, my brother in law bought us one of these the Christmas before last. I thought it was an odd gift, but then I'm surprised how little people know and/or care about all this stuff. I don't think all executables are apps though. To me, "app" suggests a program optimised for doing only one thing. The BBC weather app is an app. A banking app is an app. A web browser isn't an app, because it's a general-purpose application. More importantly, the main alternative would be "program" (civvies don't use "executable"). The phrase "Have you seen the new BBC weather program?" is ambiguous, because the recipient doesn't know whether you're talking about the TV or software. So to me it's less trendy and more an example of the English language adapting as it always does.

One of the most stunning conversions in architectural history, and one of my favourite buildings of all time.

Welcome. What an exciting project!

Sorry, did my answer on my phone and completely missed the reference to MVHR!

It's a service, so VAT is chargeable and not reclaimable.

Benign positional vertigo. I had this about 25 years ago and it was horrible. If it's related to debris in the fluid of the balancing circuits, there's a sequence of rotations you can do that bring relief, basically by moving the debris to a stable position in the circuit. I think mine was just some inflammation due to a virus - the overwhelming sensation that you were moving when you clearly weren't was horrible. Exactly like being drunk to the point where you can't lie down because the room is spinning (what was it Dean Martin said? You're not really drunk if you can lie on the floor without holding on).

Is he able to come onsite and supervise/advise someone else doing the work? You could pay him something for his presence, which would help him out. Depends on whether you're able to get another roofer (or general builder) cheaply enough, and who's willing to work under such supervision.

Where does your water come in? If it comes into the plant room, consider locating your water softener in here.

Insurance is likely to be more difficult - maybe even impossible?

Welcome Roger. As I'm sure you'll have seen, we have all types of building methods in use. Brick and block, timber frame, insulated concrete formwork, with all sorts of insulation types. The general mantra is more insulation than building regs require (high decrement delay preferred) and much better airtightness. Do you plan to do much of the work yourself?

Our house is very modern. Other than one other on a private road half a mile away, I think it's literally the only house with a flat roof for miles. According to an estate agent friend, it's modern enough to put off a lot of people, but the minority who would want to live in it will be willing to pay a significant premium. Haven't tried that theory out yet! It doesn't hurt that we lucked into the catchment area of two of the country's best state schools. There's very little housing turnover, so even when the market is slow, decent family homes on reasonable plots tend to sell when they come up.