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Ideally I would recommend 18-21mm engineered oak is used directly over UFH. I think Building regs require >18mm for a structural floor. Many people buy 14mm engineered oak then discover the 18mm minimum and have to put flooring grade chipboard under it. If they put down 18mm chipboard they end up with 18+14= 32mm of wood over the UFH and I pretty sure that must affect the heat output.

Just for info.. I read somewhere that if you glue the T&G (rather than secret nail it to joists) then it's important to ensure the joint is well glued. I forget which website I read this on but they said its not good enough just to run the nozzle of the glue bottle along the groove, you should use a brush to make sure it's all properly coated.

It's winter so the air is quite dry. Our engineered floor does move a bit with the seasons. The T&G joints open up a bit in winter and close up in summer when it's more humid. Not really an issue for us. Ours is 18mm secret nailed to joists with UFH between.

I'm pretty sure we are running our engineered oak floor quite a bit hotter than the maker specified. Water in the UFH has been as high as 55C but I don't know what the actual floor temperature gets to. It's 18mm engineered oak secret nailed to joists with a wet pipe in foiled insulation UFH system between.

Normally it's an annex if the occupiers have to use an essential facility in the main house, something like a kitchen or bathroom because they don't have one.

And if he looses then your costs as well I think.

I expect you already know this but.. https://www.lexisnexis.com/uk/lexispsl/planning/document/393788/5J82-TGD1-F18C-44CR-00000-00/Judicial_review_of_planning_decisions_overview

So i wonder how can the court give him more time if the original paperwork was flawed?

I think the council are responsible for enforcing Appeal Decisions regardless of which side they were on originally.

What is the date on the planning grant from the appeal? Neighbour only has 6 weeks from then to bring the staturory review.

Yes it does but see the link I posted above that says it must be all one dwelling. If the annex amounts to a separate dwelling then it doesn't appear to be a residential annex for the purposes of the CIL. It appears the planners can approve the outbuilding with a condition stating it "cannot be seperately occupied" and yet the CIL assessors can declare it is a seperate dwelling subject to its own seperate CIL calculation.

Answering my own question. It looks like you need to make sure the council are fighting it for you or do so yourself... https://emlawshare.co.uk/resource/judicial-review-minimum-required-local-authorities/

So looks like the neighbour is trying to fight it on the cheap and got the paperwork wrong.

Are councils obliged to fight a case taken to the High court? What if the council choose not to for financial reasons?

I wonder how long the sample sticks lie around for?

If you replace the PCB don't let them take the old one away. Most relays are pretty cheap and if they are through hole mounted types I'd have a go at replacing the relay so you have a spare PCB for the future. Edit: Heck you could probably even find a better relay.

Many years ago I was involved with consumer electronic product design. Learned the hard way that colour matching can be very difficult. For example if you had a box made of metal and plastic it was very difficult to get the paint on the metal to exactly match the plastic. Even the texture of the surface can change the apparent colour. I doubt it was anything to do with the water. My advice would be to leave it alone for a few weeks and see if you can live with it. I wouldn't go messing with grout colouring pens. Think that would end up looking untidy. If tempted try a sample somewhere hidden.

Some diverter valves have switches on them to control the pump so it doesn't run until the valve is in the right position. These switches are notoriously unreliable, especially if the valve weeps a bit. Could result in the pump being stuck on.

I think the advantage of a 2 port is more for ASHP than it is for oil/gas because when the UFH is calling for max power all the flow goes from the ASHP direct to the UFH with less mixing/blending. Not sure why there is a check valve shown in that diagram but suspect it should be removed where the source is ASHP or the defrost won't work?

This co has larger doors.. https://www.kloeber.co.uk/about/faqs/what-size-front-entrance-doors/

What do they use for the frame? Could you use two frames?

I think you would be OK building a dwelling for a specific member of staff to live in. But he would need to live there 3 years. I think they would argue that a self contained staff/guest house with all facilities was really a separate dwelling under for CIL (but perhaps not under planning legislation). So not eligible for the exemption as you can't live in two dwellings at once for 3 years. Google found this about outbuildings and extensions. Not exactly what you are asking about but seems relevant... https://localgovernmentlawyer.co.uk/property/313-property-features/48811-work-sheds-and-cil I suspect the example you have hasn't been tested in court.

https://www.gassaferegister.co.uk/media/1715/bs-6891-2015-installation-and-maintenance-of-pipework-of-up-to-35mm.pdf Para 8.9.9 on page 33 suggest pipes can be run in floor voids provided they are ventilated to some standard.

Rather old but.. https://www.diynot.com/diy/threads/vented-gas-pipe.178146/ Google says TB 217 is now renumbered TB 113. Sadly it appears you need to be gas safe registered to access the technical bulletins.

Sorry if this is obvious but... Did they just forget to print a page? I think I would check that the planning grant you were sent matches the electronic copy of the planning grant online. Forget about the Planning Officers report. If both copies are the same and you got all pages then I'd just get on with it. Is the missing schedule referred to elsewhere in the planning grant? If not then again I'd just get on with it. If you fitted really horrible out of keeping windows and the planners wanted to force you to rectify the situation I believe they would have to pay out for a Judicial Review (around £10k) and they would have to pay you compensation (costs to replace the windows). So over all I think it very unlikely they would go down that route.